TY  - JOUR
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5937
AB  - The vaporization of LiI, LiI/C-70 and LiI/LIF/C-70 was studied using a Knudsen cell located in the ionization chamber of a magnetic sector mass spectrometer in the temperature range from 350 degrees C to 850 degrees C. The ion species, LinI+ (n = 2, 3, 4 or 6) were identified from the mixture LiI/C-70, while the clusters LinI+ and LinF+ (n = 2, 3, 4, 5 or 6) were detected from a mixture LiI/LiF/C-70. The intensities of LinI+ were higher than the emission of LinF+ cluster when the ratio of LiI to LiF was 2:1. By contrast, the emission of LinF+ is favored when the ratio of LiI to LiF was 1:2. These results show that the vaporization of a mixture LiI/LIF/C-70 from a Knudsen cell located in the ionization chamber of a mass spectrometer represents an efficient and simple way to obtain and investigate clusters of the type LinX, X = F or I. In this work, it was also shown that the trends of the In (Intensity, arb. units) versus temperature for all LinI+ clusters below and above the melting point of LiI were not same. This suggested that the manner of formation of these clusters could be different due to changes in temperature.
T2  - Journal of the Serbian Chemical Society
T1  - Study of the vaporization of LiI, LiI/C-70, LiI/LiF/C-70 from a Knudsen cell located in the ionization chamber of a mass spectrometer
VL  - 79
IS  - 3
SP  - 313
EP  - 324
DO  - 10.2298/JSC130627083D
ER  - 

@article{
author = "Đustebek, Jasmina B. and Veljković, Miomir V. and Veličković, Suzana",
year = "2014",
abstract = "The vaporization of LiI, LiI/C-70 and LiI/LIF/C-70 was studied using a Knudsen cell located in the ionization chamber of a magnetic sector mass spectrometer in the temperature range from 350 degrees C to 850 degrees C. The ion species, LinI+ (n = 2, 3, 4 or 6) were identified from the mixture LiI/C-70, while the clusters LinI+ and LinF+ (n = 2, 3, 4, 5 or 6) were detected from a mixture LiI/LiF/C-70. The intensities of LinI+ were higher than the emission of LinF+ cluster when the ratio of LiI to LiF was 2:1. By contrast, the emission of LinF+ is favored when the ratio of LiI to LiF was 1:2. These results show that the vaporization of a mixture LiI/LIF/C-70 from a Knudsen cell located in the ionization chamber of a mass spectrometer represents an efficient and simple way to obtain and investigate clusters of the type LinX, X = F or I. In this work, it was also shown that the trends of the In (Intensity, arb. units) versus temperature for all LinI+ clusters below and above the melting point of LiI were not same. This suggested that the manner of formation of these clusters could be different due to changes in temperature.",
journal = "Journal of the Serbian Chemical Society",
title = "Study of the vaporization of LiI, LiI/C-70, LiI/LiF/C-70 from a Knudsen cell located in the ionization chamber of a mass spectrometer",
volume = "79",
number = "3",
pages = "313-324",
doi = "10.2298/JSC130627083D"
}

Đustebek, J. B., Veljković, M. V.,& Veličković, S.. (2014). Study of the vaporization of LiI, LiI/C-70, LiI/LiF/C-70 from a Knudsen cell located in the ionization chamber of a mass spectrometer. in Journal of the Serbian Chemical Society, 79(3), 313-324.
https://doi.org/10.2298/JSC130627083D

Đustebek JB, Veljković MV, Veličković S. Study of the vaporization of LiI, LiI/C-70, LiI/LiF/C-70 from a Knudsen cell located in the ionization chamber of a mass spectrometer. in Journal of the Serbian Chemical Society. 2014;79(3):313-324.
doi:10.2298/JSC130627083D .

Đustebek, Jasmina B., Veljković, Miomir V., Veličković, Suzana, "Study of the vaporization of LiI, LiI/C-70, LiI/LiF/C-70 from a Knudsen cell located in the ionization chamber of a mass spectrometer" in Journal of the Serbian Chemical Society, 79, no. 3 (2014):313-324,
https://doi.org/10.2298/JSC130627083D . .

TY  - JOUR
AU  - Đustebek, Jasmina B.
AU  - Milovanović, Milan
AU  - Jerosimic, Stanka
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5269
AB  - The neutrals of the LinI (n = 2-6) clusters were detected using Knudsen-cell which was placed into ionization chamber of the magnetic sector mass spectrometer. The first theoretical and experimental data on the Li3I and Li5I clusters were presented in this Letter. The ionization energies of the neutral of Li3I and Li5I clusters, obtained by the electron impact ionization mass spectrometry, were (5.14 +/- 0.25) and (4.62 +/- 0.25) eV, respectively. We report the geometry, ionization energies and thermodynamical stability of these clusters, calculated at the restricted coupled cluster RHF-RCCSD/cc-pVTZ(Li), cc-pVTZ-PP(I) level of theory. (C) 2012 Elsevier B. V. All rights reserved.
T2  - Chemical Physics Letters
T1  - Theoretical and experimental study of the non-stoichiometric LinI (n=3 and 5) clusters
VL  - 556
SP  - 380
EP  - 385
DO  - 10.1016/j.cplett.2012.11.086
ER  - 

@article{
author = "Đustebek, Jasmina B. and Milovanović, Milan and Jerosimic, Stanka and Veljković, Miomir V. and Veličković, Suzana",
year = "2013",
abstract = "The neutrals of the LinI (n = 2-6) clusters were detected using Knudsen-cell which was placed into ionization chamber of the magnetic sector mass spectrometer. The first theoretical and experimental data on the Li3I and Li5I clusters were presented in this Letter. The ionization energies of the neutral of Li3I and Li5I clusters, obtained by the electron impact ionization mass spectrometry, were (5.14 +/- 0.25) and (4.62 +/- 0.25) eV, respectively. We report the geometry, ionization energies and thermodynamical stability of these clusters, calculated at the restricted coupled cluster RHF-RCCSD/cc-pVTZ(Li), cc-pVTZ-PP(I) level of theory. (C) 2012 Elsevier B. V. All rights reserved.",
journal = "Chemical Physics Letters",
title = "Theoretical and experimental study of the non-stoichiometric LinI (n=3 and 5) clusters",
volume = "556",
pages = "380-385",
doi = "10.1016/j.cplett.2012.11.086"
}

Đustebek, J. B., Milovanović, M., Jerosimic, S., Veljković, M. V.,& Veličković, S.. (2013). Theoretical and experimental study of the non-stoichiometric LinI (n=3 and 5) clusters. in Chemical Physics Letters, 556, 380-385.
https://doi.org/10.1016/j.cplett.2012.11.086

Đustebek JB, Milovanović M, Jerosimic S, Veljković MV, Veličković S. Theoretical and experimental study of the non-stoichiometric LinI (n=3 and 5) clusters. in Chemical Physics Letters. 2013;556:380-385.
doi:10.1016/j.cplett.2012.11.086 .

Đustebek, Jasmina B., Milovanović, Milan, Jerosimic, Stanka, Veljković, Miomir V., Veličković, Suzana, "Theoretical and experimental study of the non-stoichiometric LinI (n=3 and 5) clusters" in Chemical Physics Letters, 556 (2013):380-385,
https://doi.org/10.1016/j.cplett.2012.11.086 . .

TY  - JOUR
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5370
AB  - The process of generating dilithium fluoride ion from the samples of LiF, LiF/C-60, LIF/LiI, and LIF/LiI/C-60 using a double and a triple filament thermal ionization source for a mass spectrometer was studied. This cluster belong to the superalkali class that can form the building block for new nanoscale cluster assembled materials. The results show that in the case of the double filament thermal source when the solution of LiF/C60 was used the Li2F+ ion was detected in the longest temperature range of the evaporation filament. On the other hand, the best abundances of Li2F+ ion was obtained when the solution of LiF/C-60 were loaded on the evaporation filaments of the triple filament thermal ionization source. It has also been found that several different processes are involved in the generation of Li2F+ by the triple filament thermal source: (1) Li2F2 - GT Li2F+ + F; (2) Li+ + LiF - GT Li2F+; and (3) Li+(from LiI) + LiF - GT Li2F+. Reaction (1) is dominant at the low temperatures of evaporation filament (Te), reaction (2) it appears at Te GT 1000 degrees K, for all four above mentioned samples. Reaction (3) appears when the samples were the solution of LiF/LiI and LiF/LiI/C-60 at the high temperature of the evaporation filament.
T2  - Digest Journal of Nanomaterials and Biostructures
T1  - Major Factors Affecting the Emission of Dilithium-Fluoride Cluster Ion in Thermal Ionization Mass Spectrometry
VL  - 8
IS  - 1
SP  - 359
EP  - 366
UR  - https://hdl.handle.net/21.15107/rcub_vinar_5370
ER  - 

@article{
author = "Đustebek, Jasmina B. and Veljković, Miomir V. and Veličković, Suzana",
year = "2013",
abstract = "The process of generating dilithium fluoride ion from the samples of LiF, LiF/C-60, LIF/LiI, and LIF/LiI/C-60 using a double and a triple filament thermal ionization source for a mass spectrometer was studied. This cluster belong to the superalkali class that can form the building block for new nanoscale cluster assembled materials. The results show that in the case of the double filament thermal source when the solution of LiF/C60 was used the Li2F+ ion was detected in the longest temperature range of the evaporation filament. On the other hand, the best abundances of Li2F+ ion was obtained when the solution of LiF/C-60 were loaded on the evaporation filaments of the triple filament thermal ionization source. It has also been found that several different processes are involved in the generation of Li2F+ by the triple filament thermal source: (1) Li2F2 - GT Li2F+ + F; (2) Li+ + LiF - GT Li2F+; and (3) Li+(from LiI) + LiF - GT Li2F+. Reaction (1) is dominant at the low temperatures of evaporation filament (Te), reaction (2) it appears at Te GT 1000 degrees K, for all four above mentioned samples. Reaction (3) appears when the samples were the solution of LiF/LiI and LiF/LiI/C-60 at the high temperature of the evaporation filament.",
journal = "Digest Journal of Nanomaterials and Biostructures",
title = "Major Factors Affecting the Emission of Dilithium-Fluoride Cluster Ion in Thermal Ionization Mass Spectrometry",
volume = "8",
number = "1",
pages = "359-366",
url = "https://hdl.handle.net/21.15107/rcub_vinar_5370"
}

Đustebek, J. B., Veljković, M. V.,& Veličković, S.. (2013). Major Factors Affecting the Emission of Dilithium-Fluoride Cluster Ion in Thermal Ionization Mass Spectrometry. in Digest Journal of Nanomaterials and Biostructures, 8(1), 359-366.
https://hdl.handle.net/21.15107/rcub_vinar_5370

Đustebek JB, Veljković MV, Veličković S. Major Factors Affecting the Emission of Dilithium-Fluoride Cluster Ion in Thermal Ionization Mass Spectrometry. in Digest Journal of Nanomaterials and Biostructures. 2013;8(1):359-366.
https://hdl.handle.net/21.15107/rcub_vinar_5370 .

Đustebek, Jasmina B., Veljković, Miomir V., Veličković, Suzana, "Major Factors Affecting the Emission of Dilithium-Fluoride Cluster Ion in Thermal Ionization Mass Spectrometry" in Digest Journal of Nanomaterials and Biostructures, 8, no. 1 (2013):359-366,
https://hdl.handle.net/21.15107/rcub_vinar_5370 .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Đustebek, Jasmina B.
AU  - Veljković, Filip M.
AU  - Radak, Bojan
AU  - Veljković, Miomir V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4666
AB  - RATIONALE: Theoretical calculations have shown that the first ionization energy of clusters of the type LinCl (n GT = 2), with more than eight valent electrons, is lower than that of alkali metal atoms; hence they are named superalkali. Superalkali clusters can mimic the chemical behavior of alkali metals and may be used as building blocks of new cluster-assembled materials. There is currently no reliable experimental proof of this kind of clusters and such proof is required. METHODS: The LinCl (n = 2-6) clusters were produced by a thermal ionization source of modified design, and mass selected by a magnetic-sector mass spectrometer. The modification pertains to the replacement of the side filaments by a cylinder in the triple-filament thermal ionization source. The sample, which is LiCl salt, was pressed into a ring and placed on the inner wall of the cylinder. RESULTS: It was observed that the ions of clusters with an even number of lithium atoms (Li2Cl+, Li4Cl+, Li6Cl+) are more stable than the odd-numbered ones (Li5Cl+, Li3Cl+). The ionization energies were determined to be 3.98 +/- 0.25 eV for Li2Cl, 4.10 +/- 0.25 eV for Li3Cl, 3.90 +/- 0.25 eV for Li4Cl, 4.01 +/- 0.25 eV for Li5Cl, and 4.09 +/- 0.25 eV for Li6Cl. The presence of a halogen atom reduces the ionization energy of the metal clusters. CONCLUSIONS: The thermal ionization source of modified design presents a suitable simple way to obtaining and measuring the ionization energies of very small lithium monochloride clusters. Clusters LinCl, n = 4 to 6, were detected for the first time. Copyright (C) 2012 John Wiley and Sons, Ltd.
T2  - Rapid Communications in Mass Spectrometry
T1  - Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry
VL  - 26
IS  - 4
SP  - 443
EP  - 448
DO  - 10.1002/rcm.6122
ER  - 

@article{
author = "Veličković, Suzana and Đustebek, Jasmina B. and Veljković, Filip M. and Radak, Bojan and Veljković, Miomir V.",
year = "2012",
abstract = "RATIONALE: Theoretical calculations have shown that the first ionization energy of clusters of the type LinCl (n GT = 2), with more than eight valent electrons, is lower than that of alkali metal atoms; hence they are named superalkali. Superalkali clusters can mimic the chemical behavior of alkali metals and may be used as building blocks of new cluster-assembled materials. There is currently no reliable experimental proof of this kind of clusters and such proof is required. METHODS: The LinCl (n = 2-6) clusters were produced by a thermal ionization source of modified design, and mass selected by a magnetic-sector mass spectrometer. The modification pertains to the replacement of the side filaments by a cylinder in the triple-filament thermal ionization source. The sample, which is LiCl salt, was pressed into a ring and placed on the inner wall of the cylinder. RESULTS: It was observed that the ions of clusters with an even number of lithium atoms (Li2Cl+, Li4Cl+, Li6Cl+) are more stable than the odd-numbered ones (Li5Cl+, Li3Cl+). The ionization energies were determined to be 3.98 +/- 0.25 eV for Li2Cl, 4.10 +/- 0.25 eV for Li3Cl, 3.90 +/- 0.25 eV for Li4Cl, 4.01 +/- 0.25 eV for Li5Cl, and 4.09 +/- 0.25 eV for Li6Cl. The presence of a halogen atom reduces the ionization energy of the metal clusters. CONCLUSIONS: The thermal ionization source of modified design presents a suitable simple way to obtaining and measuring the ionization energies of very small lithium monochloride clusters. Clusters LinCl, n = 4 to 6, were detected for the first time. Copyright (C) 2012 John Wiley and Sons, Ltd.",
journal = "Rapid Communications in Mass Spectrometry",
title = "Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry",
volume = "26",
number = "4",
pages = "443-448",
doi = "10.1002/rcm.6122"
}

Veličković, S., Đustebek, J. B., Veljković, F. M., Radak, B.,& Veljković, M. V.. (2012). Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry, 26(4), 443-448.
https://doi.org/10.1002/rcm.6122

Veličković S, Đustebek JB, Veljković FM, Radak B, Veljković MV. Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry. 2012;26(4):443-448.
doi:10.1002/rcm.6122 .

Veličković, Suzana, Đustebek, Jasmina B., Veljković, Filip M., Radak, Bojan, Veljković, Miomir V., "Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry" in Rapid Communications in Mass Spectrometry, 26, no. 4 (2012):443-448,
https://doi.org/10.1002/rcm.6122 . .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Đustebek, Jasmina B.
AU  - Veljković, Filip M.
AU  - Veljković, Miomir V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4898
AB  - Clusters of the type LinX (X = halides) can be considered as potential building blocks of cluster-assembly materials. In this work, LinBr (n = 2-7) clusters were obtained by a thermal ionization source of modified design and selected by a magnetic sector mass spectrometer. Positive ions of the LinBr (n = 4-7) cluster were detected for the first time. The order of ion intensities was Li2Br+ Li4Br+ GT Li5Br+ GT Li6Br+ GT Li3Br+. The ionization energies (IEs) were measured and found to be 3.95 +/- 0.20 eV for Li2Br, 3.92 +/- 0.20 eV for Li3Br, 3.93 +/- 0.20 eV for Li4Br, 4.08 +/- 0.20 eV for Li5Br, 4.14 +/- 0.20 eV for Li6Br and 4.19 +/- 0.20 eV for Li7Br. All of these clusters have a much lower ionization potential than that of the lithium atom, so they belong to the superalkali class. The IEs of LinBr (n = 2-4) are slightly lower than those in the corresponding small Li-n or LinH clusters, whereas the IEs of LinBr are very similar to those of Li-n or LinH for n = 5 and 6. The thermal ionization source of modified design is an important means for simultaneously obtaining and measuring the IEs of LinBr (n = 2-7) clusters (because their ions are thermodynamically stable with respect to the loss of lithium atoms in the gas phase) and increasingly contributes toward the development of clusters for practical applications. Copyright (C) 2012 John Wiley and Sons, Ltd.
T2  - Journal of Mass Spectrometry
T1  - Formation of positive cluster ions LinBr (n=2-7) and ionization energies studied by thermal ionization mass spectrometry
VL  - 47
IS  - 5
SP  - 627
EP  - 631
DO  - 10.1002/jms.3001
ER  - 

@article{
author = "Veličković, Suzana and Đustebek, Jasmina B. and Veljković, Filip M. and Veljković, Miomir V.",
year = "2012",
abstract = "Clusters of the type LinX (X = halides) can be considered as potential building blocks of cluster-assembly materials. In this work, LinBr (n = 2-7) clusters were obtained by a thermal ionization source of modified design and selected by a magnetic sector mass spectrometer. Positive ions of the LinBr (n = 4-7) cluster were detected for the first time. The order of ion intensities was Li2Br+ Li4Br+ GT Li5Br+ GT Li6Br+ GT Li3Br+. The ionization energies (IEs) were measured and found to be 3.95 +/- 0.20 eV for Li2Br, 3.92 +/- 0.20 eV for Li3Br, 3.93 +/- 0.20 eV for Li4Br, 4.08 +/- 0.20 eV for Li5Br, 4.14 +/- 0.20 eV for Li6Br and 4.19 +/- 0.20 eV for Li7Br. All of these clusters have a much lower ionization potential than that of the lithium atom, so they belong to the superalkali class. The IEs of LinBr (n = 2-4) are slightly lower than those in the corresponding small Li-n or LinH clusters, whereas the IEs of LinBr are very similar to those of Li-n or LinH for n = 5 and 6. The thermal ionization source of modified design is an important means for simultaneously obtaining and measuring the IEs of LinBr (n = 2-7) clusters (because their ions are thermodynamically stable with respect to the loss of lithium atoms in the gas phase) and increasingly contributes toward the development of clusters for practical applications. Copyright (C) 2012 John Wiley and Sons, Ltd.",
journal = "Journal of Mass Spectrometry",
title = "Formation of positive cluster ions LinBr (n=2-7) and ionization energies studied by thermal ionization mass spectrometry",
volume = "47",
number = "5",
pages = "627-631",
doi = "10.1002/jms.3001"
}

Veličković, S., Đustebek, J. B., Veljković, F. M.,& Veljković, M. V.. (2012). Formation of positive cluster ions LinBr (n=2-7) and ionization energies studied by thermal ionization mass spectrometry. in Journal of Mass Spectrometry, 47(5), 627-631.
https://doi.org/10.1002/jms.3001

Veličković S, Đustebek JB, Veljković FM, Veljković MV. Formation of positive cluster ions LinBr (n=2-7) and ionization energies studied by thermal ionization mass spectrometry. in Journal of Mass Spectrometry. 2012;47(5):627-631.
doi:10.1002/jms.3001 .

Veličković, Suzana, Đustebek, Jasmina B., Veljković, Filip M., Veljković, Miomir V., "Formation of positive cluster ions LinBr (n=2-7) and ionization energies studied by thermal ionization mass spectrometry" in Journal of Mass Spectrometry, 47, no. 5 (2012):627-631,
https://doi.org/10.1002/jms.3001 . .

TY  - JOUR
AU  - Veljković, Filip M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
AU  - Perić-Grujić, Aleksandra A.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4942
AB  - RATIONALE The very small clusters of the type KnF are of particular importance since their first ionization energies (IEs) are lower than those of the alkali metal atoms. Theoretical calculation has demonstrated that this kind of cluster represents a potential building block for cluster-assembly materials with unique structural, electronic, optical, magnetic, and thermodynamic properties. To date, however, there have been no experimental results on the IEs of KnF (n GT 2) clusters. METHOD KnF (n?=?26) clusters were produced by the evaporation of a solid potassium fluoride salt using a modified thermal ionization source of modified design, and mass selected by a magnetic sector mass spectrometer where their IEs were determined. RESULTS Clusters KnF (n?=?36) were detected for the first time. The order of the ion intensities was K2F+ GT ? GT ?K4F+ GT ? GT ?K3F+K6F+? GT ?K5F+. The determined IEs were 3.99 +/- 0.20?eV for K2F, 4.16 +/- 0.20?eV for K3F, 4.27 +/- 0.20?eV for K4F, 4.22 +/- 0.20?eV for K5F, and 4.31 +/- 0.20?eV for K6F. The IEs of KnF increase slightly with the increase in potassium atom number from 2 to 6. We also observed that the presence of a fluorine atom leads to increasing ionization energy of bare metal potassium clusters. CONCLUSIONS The modified thermal ionization source provides an efficient way of obtaining the fluorine-doped potassium clusters. These results also present experimental proof that KnF (n?=?26) clusters belong to the group of superalkali species. Copyright (C)2012 John Wiley and Sons, Ltd.
T2  - Rapid Communications in Mass Spectrometry
T1  - Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry
VL  - 26
IS  - 16
SP  - 1761
EP  - 1766
DO  - 10.1002/rcm.6284
ER  - 

@article{
author = "Veljković, Filip M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Veličković, Suzana and Perić-Grujić, Aleksandra A.",
year = "2012",
abstract = "RATIONALE The very small clusters of the type KnF are of particular importance since their first ionization energies (IEs) are lower than those of the alkali metal atoms. Theoretical calculation has demonstrated that this kind of cluster represents a potential building block for cluster-assembly materials with unique structural, electronic, optical, magnetic, and thermodynamic properties. To date, however, there have been no experimental results on the IEs of KnF (n GT 2) clusters. METHOD KnF (n?=?26) clusters were produced by the evaporation of a solid potassium fluoride salt using a modified thermal ionization source of modified design, and mass selected by a magnetic sector mass spectrometer where their IEs were determined. RESULTS Clusters KnF (n?=?36) were detected for the first time. The order of the ion intensities was K2F+ GT ? GT ?K4F+ GT ? GT ?K3F+K6F+? GT ?K5F+. The determined IEs were 3.99 +/- 0.20?eV for K2F, 4.16 +/- 0.20?eV for K3F, 4.27 +/- 0.20?eV for K4F, 4.22 +/- 0.20?eV for K5F, and 4.31 +/- 0.20?eV for K6F. The IEs of KnF increase slightly with the increase in potassium atom number from 2 to 6. We also observed that the presence of a fluorine atom leads to increasing ionization energy of bare metal potassium clusters. CONCLUSIONS The modified thermal ionization source provides an efficient way of obtaining the fluorine-doped potassium clusters. These results also present experimental proof that KnF (n?=?26) clusters belong to the group of superalkali species. Copyright (C)2012 John Wiley and Sons, Ltd.",
journal = "Rapid Communications in Mass Spectrometry",
title = "Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry",
volume = "26",
number = "16",
pages = "1761-1766",
doi = "10.1002/rcm.6284"
}

Veljković, F. M., Đustebek, J. B., Veljković, M. V., Veličković, S.,& Perić-Grujić, A. A.. (2012). Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry, 26(16), 1761-1766.
https://doi.org/10.1002/rcm.6284

Veljković FM, Đustebek JB, Veljković MV, Veličković S, Perić-Grujić AA. Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry. 2012;26(16):1761-1766.
doi:10.1002/rcm.6284 .

Veljković, Filip M., Đustebek, Jasmina B., Veljković, Miomir V., Veličković, Suzana, Perić-Grujić, Aleksandra A., "Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry" in Rapid Communications in Mass Spectrometry, 26, no. 16 (2012):1761-1766,
https://doi.org/10.1002/rcm.6284 . .

TY  - JOUR
AU  - Veljković, Filip M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Perić-Grujić, Aleksandra A.
AU  - Veličković, Suzana
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5164
AB  - The theoretical calculations have predicted that nonmetal-doped potassium clusters can be used in the synthesis of a new class of charge-transfer salts which can be considered as potential building blocks for the assembly of novel nanostructured material. In this work, KnCl (n?=?26) and KnCln-1 (n?=?3 and 4) clusters were produced by vaporization of a solid potassium chloride salt in a thermal ionization mass spectrometry. The ionization energies (IEs) were measured, and found to be 3.64?+/-?0.20?eV for K2Cl, 3.67?+/-?0.20?eV for K3Cl, 3.62?+/-?0.20?eV for K4Cl, 3.57?+/-?0.20?eV for K5Cl, 3.69?+/-?0.20?eV for K6Cl, 3.71?+/-?0.20?eV for K3Cl2 and 3.72?+/-?0.20?eV for K4Cl3. The KnCl+ (n?=?36) clusters were detected for the first time in a cluster beam generated by the thermal ionization source of modified design. Also, this work is the first to report experimentally obtained values of IEs for KnCl+ (n?=?36) and KnCln-1+ (n?=?3 and 4) clusters. The ionization energies for KnCl+ and KnCln-1+ clusters are much lower than the 4.34?eV of the potassium atom; hence, these clusters should be classified as superalkali species. Copyright (c) 2012 John Wiley and Sons, Ltd.
T2  - Journal of Mass Spectrometry
T1  - Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry
VL  - 47
IS  - 11
SP  - 1495
EP  - 1499
DO  - 10.1002/jms.3076
ER  - 

@article{
author = "Veljković, Filip M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Perić-Grujić, Aleksandra A. and Veličković, Suzana",
year = "2012",
abstract = "The theoretical calculations have predicted that nonmetal-doped potassium clusters can be used in the synthesis of a new class of charge-transfer salts which can be considered as potential building blocks for the assembly of novel nanostructured material. In this work, KnCl (n?=?26) and KnCln-1 (n?=?3 and 4) clusters were produced by vaporization of a solid potassium chloride salt in a thermal ionization mass spectrometry. The ionization energies (IEs) were measured, and found to be 3.64?+/-?0.20?eV for K2Cl, 3.67?+/-?0.20?eV for K3Cl, 3.62?+/-?0.20?eV for K4Cl, 3.57?+/-?0.20?eV for K5Cl, 3.69?+/-?0.20?eV for K6Cl, 3.71?+/-?0.20?eV for K3Cl2 and 3.72?+/-?0.20?eV for K4Cl3. The KnCl+ (n?=?36) clusters were detected for the first time in a cluster beam generated by the thermal ionization source of modified design. Also, this work is the first to report experimentally obtained values of IEs for KnCl+ (n?=?36) and KnCln-1+ (n?=?3 and 4) clusters. The ionization energies for KnCl+ and KnCln-1+ clusters are much lower than the 4.34?eV of the potassium atom; hence, these clusters should be classified as superalkali species. Copyright (c) 2012 John Wiley and Sons, Ltd.",
journal = "Journal of Mass Spectrometry",
title = "Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry",
volume = "47",
number = "11",
pages = "1495-1499",
doi = "10.1002/jms.3076"
}

Veljković, F. M., Đustebek, J. B., Veljković, M. V., Perić-Grujić, A. A.,& Veličković, S.. (2012). Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry. in Journal of Mass Spectrometry, 47(11), 1495-1499.
https://doi.org/10.1002/jms.3076

Veljković FM, Đustebek JB, Veljković MV, Perić-Grujić AA, Veličković S. Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry. in Journal of Mass Spectrometry. 2012;47(11):1495-1499.
doi:10.1002/jms.3076 .

Veljković, Filip M., Đustebek, Jasmina B., Veljković, Miomir V., Perić-Grujić, Aleksandra A., Veličković, Suzana, "Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry" in Journal of Mass Spectrometry, 47, no. 11 (2012):1495-1499,
https://doi.org/10.1002/jms.3076 . .

TY  - JOUR
AU  - Đustebek, Jasmina B.
AU  - Veličković, Suzana
AU  - Veljković, Filip M.
AU  - Veljković, Miomir V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5228
AB  - The superalkali clusters are important because they can be considered as potential building block for the assembly of novel nanostructured materials with unique structural, electronic, optical, magnetic, and thermodynamic properties. We have modified and used the Knudsen cell mass spectrometer in order to obtain and measurement of the ionization potentials of the superalkali clusters. In this work the clusters LinF (n = 2 - 6) have produces in the vapor over a mixture of lithium fluoride and lithium iodide by means of Knudsen cell which is placed into ionization chamber of the magnetic sector mass spectrometer. The simultaneous production and mass spectrometric detection of the ionic of clusters provide information on the conditions of formation and the distribution of these ion species. It is observed that the ions of clusters with an even numbered of lithium atoms are more stable than the ions of clusters with an odd numbered of lithium atoms. The clusters Li5F and Li6F were detected experimentally for the first time with their ionization energies of (4.29 +/- 0.25) eV, and (4.24 +/- 0.25) eV, respectively.
T2  - Digest Journal of Nanomaterials and Biostructures
T1  - Production of Heterogeneous Superalkali Clusters Linf (N=2-6) By Knudsen - Cell Mass Spectrometry
VL  - 7
IS  - 4
SP  - 1365
EP  - 1372
UR  - https://hdl.handle.net/21.15107/rcub_vinar_5228
ER  - 

@article{
author = "Đustebek, Jasmina B. and Veličković, Suzana and Veljković, Filip M. and Veljković, Miomir V.",
year = "2012",
abstract = "The superalkali clusters are important because they can be considered as potential building block for the assembly of novel nanostructured materials with unique structural, electronic, optical, magnetic, and thermodynamic properties. We have modified and used the Knudsen cell mass spectrometer in order to obtain and measurement of the ionization potentials of the superalkali clusters. In this work the clusters LinF (n = 2 - 6) have produces in the vapor over a mixture of lithium fluoride and lithium iodide by means of Knudsen cell which is placed into ionization chamber of the magnetic sector mass spectrometer. The simultaneous production and mass spectrometric detection of the ionic of clusters provide information on the conditions of formation and the distribution of these ion species. It is observed that the ions of clusters with an even numbered of lithium atoms are more stable than the ions of clusters with an odd numbered of lithium atoms. The clusters Li5F and Li6F were detected experimentally for the first time with their ionization energies of (4.29 +/- 0.25) eV, and (4.24 +/- 0.25) eV, respectively.",
journal = "Digest Journal of Nanomaterials and Biostructures",
title = "Production of Heterogeneous Superalkali Clusters Linf (N=2-6) By Knudsen - Cell Mass Spectrometry",
volume = "7",
number = "4",
pages = "1365-1372",
url = "https://hdl.handle.net/21.15107/rcub_vinar_5228"
}

Đustebek, J. B., Veličković, S., Veljković, F. M.,& Veljković, M. V.. (2012). Production of Heterogeneous Superalkali Clusters Linf (N=2-6) By Knudsen - Cell Mass Spectrometry. in Digest Journal of Nanomaterials and Biostructures, 7(4), 1365-1372.
https://hdl.handle.net/21.15107/rcub_vinar_5228

Đustebek JB, Veličković S, Veljković FM, Veljković MV. Production of Heterogeneous Superalkali Clusters Linf (N=2-6) By Knudsen - Cell Mass Spectrometry. in Digest Journal of Nanomaterials and Biostructures. 2012;7(4):1365-1372.
https://hdl.handle.net/21.15107/rcub_vinar_5228 .

Đustebek, Jasmina B., Veličković, Suzana, Veljković, Filip M., Veljković, Miomir V., "Production of Heterogeneous Superalkali Clusters Linf (N=2-6) By Knudsen - Cell Mass Spectrometry" in Digest Journal of Nanomaterials and Biostructures, 7, no. 4 (2012):1365-1372,
https://hdl.handle.net/21.15107/rcub_vinar_5228 .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Veljković, Filip M.
AU  - Perić-Grujić, Aleksandra A.
AU  - Radak, Bojan
AU  - Veljković, Miomir V.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4444
AB  - The electronic structure and properties of dipotassiummonohalides are important for understanding the unique physical and chemical behavior of MnX systems. In the present study, K2X (here X=F, Cl, Br, I) clusters were generated in the vapor over salts of the corresponding potassium halide, using a magnetic sector thermal ionization mass spectrometer. The ionization energies obtained for K2F, K2Cl, K2Br, and K2I molecules were 3.82 +/- 0.1eV, 3.68 +/- 0.1eV, 3.95 +/- 0.1eV, and 3.92 +/- 0.1, respectively. These experimental values of ionization energies for K2X (X=F, Br, and I) are presented for the first time. The ionization energy of K2Cl determined by thermal ionization corresponds to previous results obtained by photoionization mass spectrometry, and it agrees with the theoretical ionization energy calculated by the ab initio method. The presently obtained results support previous theoretical predictions that the excess electron in dipotassiummonohalide clusters is delocalized over two potassium atoms, which is characteristic for F-center clusters. Copyright (C) 2011 John Wiley and Sons, Ltd.
T2  - Rapid Communications in Mass Spectrometry
T1  - Ionization energies of K2X (X=F, Cl, Br, I) clusters
VL  - 25
IS  - 16
SP  - 2327
EP  - 2332
DO  - 10.1002/rcm.5128
ER  - 

@article{
author = "Veličković, Suzana and Veljković, Filip M. and Perić-Grujić, Aleksandra A. and Radak, Bojan and Veljković, Miomir V.",
year = "2011",
abstract = "The electronic structure and properties of dipotassiummonohalides are important for understanding the unique physical and chemical behavior of MnX systems. In the present study, K2X (here X=F, Cl, Br, I) clusters were generated in the vapor over salts of the corresponding potassium halide, using a magnetic sector thermal ionization mass spectrometer. The ionization energies obtained for K2F, K2Cl, K2Br, and K2I molecules were 3.82 +/- 0.1eV, 3.68 +/- 0.1eV, 3.95 +/- 0.1eV, and 3.92 +/- 0.1, respectively. These experimental values of ionization energies for K2X (X=F, Br, and I) are presented for the first time. The ionization energy of K2Cl determined by thermal ionization corresponds to previous results obtained by photoionization mass spectrometry, and it agrees with the theoretical ionization energy calculated by the ab initio method. The presently obtained results support previous theoretical predictions that the excess electron in dipotassiummonohalide clusters is delocalized over two potassium atoms, which is characteristic for F-center clusters. Copyright (C) 2011 John Wiley and Sons, Ltd.",
journal = "Rapid Communications in Mass Spectrometry",
title = "Ionization energies of K2X (X=F, Cl, Br, I) clusters",
volume = "25",
number = "16",
pages = "2327-2332",
doi = "10.1002/rcm.5128"
}

Veličković, S., Veljković, F. M., Perić-Grujić, A. A., Radak, B.,& Veljković, M. V.. (2011). Ionization energies of K2X (X=F, Cl, Br, I) clusters. in Rapid Communications in Mass Spectrometry, 25(16), 2327-2332.
https://doi.org/10.1002/rcm.5128

Veličković S, Veljković FM, Perić-Grujić AA, Radak B, Veljković MV. Ionization energies of K2X (X=F, Cl, Br, I) clusters. in Rapid Communications in Mass Spectrometry. 2011;25(16):2327-2332.
doi:10.1002/rcm.5128 .

Veličković, Suzana, Veljković, Filip M., Perić-Grujić, Aleksandra A., Radak, Bojan, Veljković, Miomir V., "Ionization energies of K2X (X=F, Cl, Br, I) clusters" in Rapid Communications in Mass Spectrometry, 25, no. 16 (2011):2327-2332,
https://doi.org/10.1002/rcm.5128 . .

TY  - JOUR
AU  - Đustebek, Jasmina B.
AU  - Veličković, Suzana
AU  - Jerosimic, Stanka
AU  - Veljković, Miomir V.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4424
AB  - We report a combined experimental and theoretical investigation of small heterogeneous clusters of lithium iodide. Apparatus based on magnetic sector instrument, where Knudsen cell is placed into the ionization chamber, provides suitable conditions for the detection of both the ionic and neutral components of LinI (n = 2, 4, 6) clusters. The clusters Li4I and Li6I were detected experimentally for the first time. Ionization potentials determined by the electron impact ionization mass spectrometry were (4.69 +/- 0.25) eV for Li2I, (4.86 +/- 0.25) eV for Li4I and (4.96 +/- 0.25) eV for Li6I. The ionization potential of Li2I corresponds to previous experimental data obtained by thermal ionization mass spectrometry. The first theoretical data of the ionization potential and structure of the above mentioned clusters are presented in this work. A comparison with the experimental ionization potentials provides evidence for the theoretically calculated geometrical structures of the small heterogeneous clusters of lithium iodide.
T2  - Journal of Analytical Atomic Spectrometry
T1  - Mass spectrometric study of the structures and ionization potential of LinI (n=2, 4, 6) clusters
VL  - 26
IS  - 8
SP  - 1641
EP  - 1647
DO  - 10.1039/c1ja10078e
ER  - 

@article{
author = "Đustebek, Jasmina B. and Veličković, Suzana and Jerosimic, Stanka and Veljković, Miomir V.",
year = "2011",
abstract = "We report a combined experimental and theoretical investigation of small heterogeneous clusters of lithium iodide. Apparatus based on magnetic sector instrument, where Knudsen cell is placed into the ionization chamber, provides suitable conditions for the detection of both the ionic and neutral components of LinI (n = 2, 4, 6) clusters. The clusters Li4I and Li6I were detected experimentally for the first time. Ionization potentials determined by the electron impact ionization mass spectrometry were (4.69 +/- 0.25) eV for Li2I, (4.86 +/- 0.25) eV for Li4I and (4.96 +/- 0.25) eV for Li6I. The ionization potential of Li2I corresponds to previous experimental data obtained by thermal ionization mass spectrometry. The first theoretical data of the ionization potential and structure of the above mentioned clusters are presented in this work. A comparison with the experimental ionization potentials provides evidence for the theoretically calculated geometrical structures of the small heterogeneous clusters of lithium iodide.",
journal = "Journal of Analytical Atomic Spectrometry",
title = "Mass spectrometric study of the structures and ionization potential of LinI (n=2, 4, 6) clusters",
volume = "26",
number = "8",
pages = "1641-1647",
doi = "10.1039/c1ja10078e"
}

Đustebek, J. B., Veličković, S., Jerosimic, S.,& Veljković, M. V.. (2011). Mass spectrometric study of the structures and ionization potential of LinI (n=2, 4, 6) clusters. in Journal of Analytical Atomic Spectrometry, 26(8), 1641-1647.
https://doi.org/10.1039/c1ja10078e

Đustebek JB, Veličković S, Jerosimic S, Veljković MV. Mass spectrometric study of the structures and ionization potential of LinI (n=2, 4, 6) clusters. in Journal of Analytical Atomic Spectrometry. 2011;26(8):1641-1647.
doi:10.1039/c1ja10078e .

Đustebek, Jasmina B., Veličković, Suzana, Jerosimic, Stanka, Veljković, Miomir V., "Mass spectrometric study of the structures and ionization potential of LinI (n=2, 4, 6) clusters" in Journal of Analytical Atomic Spectrometry, 26, no. 8 (2011):1641-1647,
https://doi.org/10.1039/c1ja10078e . .

TY  - JOUR
AU  - Đustebek, Jasmina B.
AU  - Đorđević, Vesna R.
AU  - Cvetićanin, Jelena M.
AU  - Veličković, Suzana
AU  - Veljković, Miomir V.
AU  - Nešković, Olivera M.
AU  - Rakočević, Zlatko Lj.
AU  - Bibić, Nataša M.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3970
AB  - The present study shows simultaneous surface ionisation and electron impact ionisation during the formation and investigation of endohedral fullerenes Tc-99m"C-60 and Tc-99m"C-70. The endohedral fullerenes were generated using a mass spectrometer with a triple rhenium filament as an ion source. The ionisation energies (IE) determined were: 8.52 +/- 0.25 eV for Tc-99m"C-60 and 9.57 +/- 0.25 eV for Tc-99m"C-70.
T2  - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1  - Electron impact ionisation of encapsulated Tc-99m"C-60 and Tc-99m"C-70
VL  - 268
IS  - 5
SP  - 466
EP  - 469
DO  - 10.1016/j.nimb.2009.11.002
ER  - 

@article{
author = "Đustebek, Jasmina B. and Đorđević, Vesna R. and Cvetićanin, Jelena M. and Veličković, Suzana and Veljković, Miomir V. and Nešković, Olivera M. and Rakočević, Zlatko Lj. and Bibić, Nataša M.",
year = "2010",
abstract = "The present study shows simultaneous surface ionisation and electron impact ionisation during the formation and investigation of endohedral fullerenes Tc-99m"C-60 and Tc-99m"C-70. The endohedral fullerenes were generated using a mass spectrometer with a triple rhenium filament as an ion source. The ionisation energies (IE) determined were: 8.52 +/- 0.25 eV for Tc-99m"C-60 and 9.57 +/- 0.25 eV for Tc-99m"C-70.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Electron impact ionisation of encapsulated Tc-99m"C-60 and Tc-99m"C-70",
volume = "268",
number = "5",
pages = "466-469",
doi = "10.1016/j.nimb.2009.11.002"
}

Đustebek, J. B., Đorđević, V. R., Cvetićanin, J. M., Veličković, S., Veljković, M. V., Nešković, O. M., Rakočević, Z. Lj.,& Bibić, N. M.. (2010). Electron impact ionisation of encapsulated Tc-99m"C-60 and Tc-99m"C-70. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 268(5), 466-469.
https://doi.org/10.1016/j.nimb.2009.11.002

Đustebek JB, Đorđević VR, Cvetićanin JM, Veličković S, Veljković MV, Nešković OM, Rakočević ZL, Bibić NM. Electron impact ionisation of encapsulated Tc-99m"C-60 and Tc-99m"C-70. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2010;268(5):466-469.
doi:10.1016/j.nimb.2009.11.002 .

Đustebek, Jasmina B., Đorđević, Vesna R., Cvetićanin, Jelena M., Veličković, Suzana, Veljković, Miomir V., Nešković, Olivera M., Rakočević, Zlatko Lj., Bibić, Nataša M., "Electron impact ionisation of encapsulated Tc-99m"C-60 and Tc-99m"C-70" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 268, no. 5 (2010):466-469,
https://doi.org/10.1016/j.nimb.2009.11.002 . .

TY  - JOUR
AU  - Cvetićanin, Jelena M.
AU  - Veličković, Suzana
AU  - Đorđević, Vesna R.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Perić-Grujić, Aleksandra A.
AU  - Nešković, Olivera M.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3472
AB  - Using the ion implantation technique (introducing negatively charged fullerene into a low temperature lithium plasma column by a strong axial magnetic field) endohedral fullerenes Li"C-70, Li-2"C-70 and Li-3"C-70 were produced. Mass spectral studies (both TIMS-thermal ionization mass spectrometry and MALDI TOF MS - matrix assisted laser desorption ionization time-of-flight mass spectrometry) of these endohedral fullerenes provided detailed structural and reactivity information about these unusual species. The fragmentation of the obtained ions is shown to be by a multiple C-2 loss (shrink-wrap mechanism). According to the fact that more atoms in the fullerene make the produced endohedral less stable, Li-3"C-70 shows a big degree of instability. The presence of Li-3"C-70 was observed on MALDI TOF MS.
T2  - Journal of Optoelectronics and Advanced Materials
T1  - TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes
VL  - 10
IS  - 6
SP  - 1505
EP  - 1507
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3472
ER  - 

@article{
author = "Cvetićanin, Jelena M. and Veličković, Suzana and Đorđević, Vesna R. and Đustebek, Jasmina B. and Veljković, Miomir V. and Perić-Grujić, Aleksandra A. and Nešković, Olivera M.",
year = "2008",
abstract = "Using the ion implantation technique (introducing negatively charged fullerene into a low temperature lithium plasma column by a strong axial magnetic field) endohedral fullerenes Li"C-70, Li-2"C-70 and Li-3"C-70 were produced. Mass spectral studies (both TIMS-thermal ionization mass spectrometry and MALDI TOF MS - matrix assisted laser desorption ionization time-of-flight mass spectrometry) of these endohedral fullerenes provided detailed structural and reactivity information about these unusual species. The fragmentation of the obtained ions is shown to be by a multiple C-2 loss (shrink-wrap mechanism). According to the fact that more atoms in the fullerene make the produced endohedral less stable, Li-3"C-70 shows a big degree of instability. The presence of Li-3"C-70 was observed on MALDI TOF MS.",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes",
volume = "10",
number = "6",
pages = "1505-1507",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3472"
}

Cvetićanin, J. M., Veličković, S., Đorđević, V. R., Đustebek, J. B., Veljković, M. V., Perić-Grujić, A. A.,& Nešković, O. M.. (2008). TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes. in Journal of Optoelectronics and Advanced Materials, 10(6), 1505-1507.
https://hdl.handle.net/21.15107/rcub_vinar_3472

Cvetićanin JM, Veličković S, Đorđević VR, Đustebek JB, Veljković MV, Perić-Grujić AA, Nešković OM. TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes. in Journal of Optoelectronics and Advanced Materials. 2008;10(6):1505-1507.
https://hdl.handle.net/21.15107/rcub_vinar_3472 .

Cvetićanin, Jelena M., Veličković, Suzana, Đorđević, Vesna R., Đustebek, Jasmina B., Veljković, Miomir V., Perić-Grujić, Aleksandra A., Nešković, Olivera M., "TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes" in Journal of Optoelectronics and Advanced Materials, 10, no. 6 (2008):1505-1507,
https://hdl.handle.net/21.15107/rcub_vinar_3472 .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Đorđević, Vesna R.
AU  - Cvetićanin, Jelena M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Nešković, Olivera M.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3547
AB  - Ionization energies of non-stoichiometric LinFn-1 (n =3,4, 6) clusters determined by a thermal ionization mass spectrometry (TIMS) were 4.2 +/- 0.2 eV for Li3F2, 4.3 +/- 0.2 eV for Li4F3 and 4.1 +/- 0.2 eV for Li6F5. The ionization energy of Li6F5 cluster was obtained experimentally for the first time. The ionization energies of Li3F2 and Li4F3 are in correlation with the results obtained by photoionization time-of-flight mass spectrometry. The determined ionization energies are comparable with theoretical ionization energies calculated by ab initio method. The theoretical predictions supported that the most stable isomers of a non-stoichiometric cluster LinFn-1 (n = 3 and n = 4) in which the excess electron localizes on a specific site have a segregated electronic structure composed of the metallic part and ionic part. (C) 2008 Elsevier Ltd. All rights reserved.
T2  - Vacuum
T1  - Ionization energies of the non-stoichiometric LinFn-1 (n=3, 4, 6) clusters
VL  - 83
IS  - 2
SP  - 378
EP  - 380
DO  - 10.1016/j.vacuum.2008.05.026
ER  - 

@article{
author = "Veličković, Suzana and Đorđević, Vesna R. and Cvetićanin, Jelena M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Nešković, Olivera M.",
year = "2008",
abstract = "Ionization energies of non-stoichiometric LinFn-1 (n =3,4, 6) clusters determined by a thermal ionization mass spectrometry (TIMS) were 4.2 +/- 0.2 eV for Li3F2, 4.3 +/- 0.2 eV for Li4F3 and 4.1 +/- 0.2 eV for Li6F5. The ionization energy of Li6F5 cluster was obtained experimentally for the first time. The ionization energies of Li3F2 and Li4F3 are in correlation with the results obtained by photoionization time-of-flight mass spectrometry. The determined ionization energies are comparable with theoretical ionization energies calculated by ab initio method. The theoretical predictions supported that the most stable isomers of a non-stoichiometric cluster LinFn-1 (n = 3 and n = 4) in which the excess electron localizes on a specific site have a segregated electronic structure composed of the metallic part and ionic part. (C) 2008 Elsevier Ltd. All rights reserved.",
journal = "Vacuum",
title = "Ionization energies of the non-stoichiometric LinFn-1 (n=3, 4, 6) clusters",
volume = "83",
number = "2",
pages = "378-380",
doi = "10.1016/j.vacuum.2008.05.026"
}

Veličković, S., Đorđević, V. R., Cvetićanin, J. M., Đustebek, J. B., Veljković, M. V.,& Nešković, O. M.. (2008). Ionization energies of the non-stoichiometric LinFn-1 (n=3, 4, 6) clusters. in Vacuum, 83(2), 378-380.
https://doi.org/10.1016/j.vacuum.2008.05.026

Veličković S, Đorđević VR, Cvetićanin JM, Đustebek JB, Veljković MV, Nešković OM. Ionization energies of the non-stoichiometric LinFn-1 (n=3, 4, 6) clusters. in Vacuum. 2008;83(2):378-380.
doi:10.1016/j.vacuum.2008.05.026 .

Veličković, Suzana, Đorđević, Vesna R., Cvetićanin, Jelena M., Đustebek, Jasmina B., Veljković, Miomir V., Nešković, Olivera M., "Ionization energies of the non-stoichiometric LinFn-1 (n=3, 4, 6) clusters" in Vacuum, 83, no. 2 (2008):378-380,
https://doi.org/10.1016/j.vacuum.2008.05.026 . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Repić, Branislav
AU  - Mladenovic, Rastko
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3118
AB  - Experimental investigations of the influence of excess oxygen coefficient, H2O/coal mass ratio using high-temperature steam, mean mass diameter of pulverized coal and coal size fraction on basic characteristics of coal gasification were performed. Experiments were carried out on a laboratory scale (0.09 m i.d. x 1.5 m high) coal gasification apparatus with lignite type of coal. Influence of steam was realized through comparison of results obtained from experiments with (H2O/Coal = 0.287 kg kg(-1)) and without steam addition (H2O/coal = 0.024 kg kg(-1)). High values of carbon conversion, obtained both for finely ground and for coarse pulverized coal points to the easiness of lignite gasification, i.e. to its high suitability for gasification. (c) 2006 Elsevier Ltd. All rights reserved.
T2  - Fuel
T1  - Experimental investigation of role of steam in entrained flow coal gasification
VL  - 86
IS  - 1-2
SP  - 194
EP  - 202
DO  - 10.1016/j.fuel.2006.06.015
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Repić, Branislav and Mladenovic, Rastko and Nešković, Olivera M. and Veljković, Miomir V.",
year = "2007",
abstract = "Experimental investigations of the influence of excess oxygen coefficient, H2O/coal mass ratio using high-temperature steam, mean mass diameter of pulverized coal and coal size fraction on basic characteristics of coal gasification were performed. Experiments were carried out on a laboratory scale (0.09 m i.d. x 1.5 m high) coal gasification apparatus with lignite type of coal. Influence of steam was realized through comparison of results obtained from experiments with (H2O/Coal = 0.287 kg kg(-1)) and without steam addition (H2O/coal = 0.024 kg kg(-1)). High values of carbon conversion, obtained both for finely ground and for coarse pulverized coal points to the easiness of lignite gasification, i.e. to its high suitability for gasification. (c) 2006 Elsevier Ltd. All rights reserved.",
journal = "Fuel",
title = "Experimental investigation of role of steam in entrained flow coal gasification",
volume = "86",
number = "1-2",
pages = "194-202",
doi = "10.1016/j.fuel.2006.06.015"
}

Crnomarković, N. Đ., Repić, B., Mladenovic, R., Nešković, O. M.,& Veljković, M. V.. (2007). Experimental investigation of role of steam in entrained flow coal gasification. in Fuel, 86(1-2), 194-202.
https://doi.org/10.1016/j.fuel.2006.06.015

Crnomarković NĐ, Repić B, Mladenovic R, Nešković OM, Veljković MV. Experimental investigation of role of steam in entrained flow coal gasification. in Fuel. 2007;86(1-2):194-202.
doi:10.1016/j.fuel.2006.06.015 .

Crnomarković, Nenad Đ., Repić, Branislav, Mladenovic, Rastko, Nešković, Olivera M., Veljković, Miomir V., "Experimental investigation of role of steam in entrained flow coal gasification" in Fuel, 86, no. 1-2 (2007):194-202,
https://doi.org/10.1016/j.fuel.2006.06.015 . .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Koteski, Vasil J.
AU  - Belošević-Čavor, Jelena
AU  - Đorđević, Vesna R.
AU  - Cvetićanin, Jelena M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Nešković, Olivera M.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3323
AB  - Hypervalent molecules of Li3F and Li4F were detected experimentally for the first time. Ionization energies determined by the thermal ionization mass spectrometry were 3.8 +/- 0.2 eV for Li2F, 4.0 +/- 0.2 eV for Li3F and 3.9 +/- 0.2 eV for Li4F. The ionization energies obtained by ab initio calculations support the experimental findings. The lowest energy structures of the LinF (n = 2-4) molecules and their cations were also predicted. (C) 2007 Elsevier B.V. All rights reserved.
T2  - Chemical Physics Letters
T1  - Experimental and theoretical investigation of new hypervalent molecules LinF (n=2-4)
VL  - 448
IS  - 4-6
SP  - 151
EP  - 155
DO  - 10.1016/j.cplett.2007.09.082
ER  - 

@article{
author = "Veličković, Suzana and Koteski, Vasil J. and Belošević-Čavor, Jelena and Đorđević, Vesna R. and Cvetićanin, Jelena M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Nešković, Olivera M.",
year = "2007",
abstract = "Hypervalent molecules of Li3F and Li4F were detected experimentally for the first time. Ionization energies determined by the thermal ionization mass spectrometry were 3.8 +/- 0.2 eV for Li2F, 4.0 +/- 0.2 eV for Li3F and 3.9 +/- 0.2 eV for Li4F. The ionization energies obtained by ab initio calculations support the experimental findings. The lowest energy structures of the LinF (n = 2-4) molecules and their cations were also predicted. (C) 2007 Elsevier B.V. All rights reserved.",
journal = "Chemical Physics Letters",
title = "Experimental and theoretical investigation of new hypervalent molecules LinF (n=2-4)",
volume = "448",
number = "4-6",
pages = "151-155",
doi = "10.1016/j.cplett.2007.09.082"
}

Veličković, S., Koteski, V. J., Belošević-Čavor, J., Đorđević, V. R., Cvetićanin, J. M., Đustebek, J. B., Veljković, M. V.,& Nešković, O. M.. (2007). Experimental and theoretical investigation of new hypervalent molecules LinF (n=2-4). in Chemical Physics Letters, 448(4-6), 151-155.
https://doi.org/10.1016/j.cplett.2007.09.082

Veličković S, Koteski VJ, Belošević-Čavor J, Đorđević VR, Cvetićanin JM, Đustebek JB, Veljković MV, Nešković OM. Experimental and theoretical investigation of new hypervalent molecules LinF (n=2-4). in Chemical Physics Letters. 2007;448(4-6):151-155.
doi:10.1016/j.cplett.2007.09.082 .

Veličković, Suzana, Koteski, Vasil J., Belošević-Čavor, Jelena, Đorđević, Vesna R., Cvetićanin, Jelena M., Đustebek, Jasmina B., Veljković, Miomir V., Nešković, Olivera M., "Experimental and theoretical investigation of new hypervalent molecules LinF (n=2-4)" in Chemical Physics Letters, 448, no. 4-6 (2007):151-155,
https://doi.org/10.1016/j.cplett.2007.09.082 . .

TY  - JOUR
AU  - Perić-Grujić, Aleksandra A.
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Laušević, Zoran
AU  - Laušević, Mila D.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3349
AB  - In this work, the influence of silver and palladium on the surface of undoped, boron doped and phosphorus doped glassy carbon has been studied. The silver and palladium concentrations in solution, after metal deposition, were measured by atomic absorption spectrophotometer. The morphology of metal coatings was characterized by scanning electron microscopy. In order to investigate the nature and thermal stability of surface oxygen groups, temperature-programmed desorption method combined with mass spectrometric analyses, was performed. The results obtained have shown that silver and palladium spontaneously deposit from their salt solutions at the surface of glassy carbon samples. Silver deposits have dendrite structure, whilst palladium forms separate clusters. The highest amount of both silver and palladium deposits at the surface of sample containing the highest quantity of surface oxide complexes. It has been concluded that carboxyl groups and structure defects are responsible for metal reduction. Calculated desorption energies have shown that the surface modification by metal deposition leads to the formation of more stable surface of undoped and doped glassy carbon samples.
T2  - Bulletin of Materials Science
T1  - Surface characterization of silver and palladium modified glassy carbon
VL  - 30
IS  - 6
SP  - 587
EP  - 593
DO  - 10.1007/s12034-007-0093-7
ER  - 

@article{
author = "Perić-Grujić, Aleksandra A. and Nešković, Olivera M. and Veljković, Miomir V. and Laušević, Zoran and Laušević, Mila D.",
year = "2007",
abstract = "In this work, the influence of silver and palladium on the surface of undoped, boron doped and phosphorus doped glassy carbon has been studied. The silver and palladium concentrations in solution, after metal deposition, were measured by atomic absorption spectrophotometer. The morphology of metal coatings was characterized by scanning electron microscopy. In order to investigate the nature and thermal stability of surface oxygen groups, temperature-programmed desorption method combined with mass spectrometric analyses, was performed. The results obtained have shown that silver and palladium spontaneously deposit from their salt solutions at the surface of glassy carbon samples. Silver deposits have dendrite structure, whilst palladium forms separate clusters. The highest amount of both silver and palladium deposits at the surface of sample containing the highest quantity of surface oxide complexes. It has been concluded that carboxyl groups and structure defects are responsible for metal reduction. Calculated desorption energies have shown that the surface modification by metal deposition leads to the formation of more stable surface of undoped and doped glassy carbon samples.",
journal = "Bulletin of Materials Science",
title = "Surface characterization of silver and palladium modified glassy carbon",
volume = "30",
number = "6",
pages = "587-593",
doi = "10.1007/s12034-007-0093-7"
}

Perić-Grujić, A. A., Nešković, O. M., Veljković, M. V., Laušević, Z.,& Laušević, M. D.. (2007). Surface characterization of silver and palladium modified glassy carbon. in Bulletin of Materials Science, 30(6), 587-593.
https://doi.org/10.1007/s12034-007-0093-7

Perić-Grujić AA, Nešković OM, Veljković MV, Laušević Z, Laušević MD. Surface characterization of silver and palladium modified glassy carbon. in Bulletin of Materials Science. 2007;30(6):587-593.
doi:10.1007/s12034-007-0093-7 .

Perić-Grujić, Aleksandra A., Nešković, Olivera M., Veljković, Miomir V., Laušević, Zoran, Laušević, Mila D., "Surface characterization of silver and palladium modified glassy carbon" in Bulletin of Materials Science, 30, no. 6 (2007):587-593,
https://doi.org/10.1007/s12034-007-0093-7 . .

TY  - JOUR
AU  - Đorđević, Vesna R.
AU  - Đustebek, Jasmina B.
AU  - Cvetićanin, Jelena M.
AU  - Veličković, Suzana
AU  - Veljković, Miomir V.
AU  - Bokorov, M.
AU  - Babić-Stojić, Branka S.
AU  - Nešković, Olivera M.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3065
AB  - In an attempt to purify MWNT in mild conditions, we have applied two different methods of purification. The first method of purifying the material was a combination of relatively often used methods, such as etching and acid treatment, and the second method was a relatively new one, using an organic polymer PmPV. Sample purity was obtained with SEM and ESR techniques.
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Methods of purification and characterization of carbon nanotubes
VL  - 8
IS  - 4
SP  - 1631
EP  - 1634
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3065
ER  - 

@article{
author = "Đorđević, Vesna R. and Đustebek, Jasmina B. and Cvetićanin, Jelena M. and Veličković, Suzana and Veljković, Miomir V. and Bokorov, M. and Babić-Stojić, Branka S. and Nešković, Olivera M.",
year = "2006",
abstract = "In an attempt to purify MWNT in mild conditions, we have applied two different methods of purification. The first method of purifying the material was a combination of relatively often used methods, such as etching and acid treatment, and the second method was a relatively new one, using an organic polymer PmPV. Sample purity was obtained with SEM and ESR techniques.",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Methods of purification and characterization of carbon nanotubes",
volume = "8",
number = "4",
pages = "1631-1634",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3065"
}

Đorđević, V. R., Đustebek, J. B., Cvetićanin, J. M., Veličković, S., Veljković, M. V., Bokorov, M., Babić-Stojić, B. S.,& Nešković, O. M.. (2006). Methods of purification and characterization of carbon nanotubes. in Journal of Optoelectronics and Advanced Materials, 8(4), 1631-1634.
https://hdl.handle.net/21.15107/rcub_vinar_3065

Đorđević VR, Đustebek JB, Cvetićanin JM, Veličković S, Veljković MV, Bokorov M, Babić-Stojić BS, Nešković OM. Methods of purification and characterization of carbon nanotubes. in Journal of Optoelectronics and Advanced Materials. 2006;8(4):1631-1634.
https://hdl.handle.net/21.15107/rcub_vinar_3065 .

Đorđević, Vesna R., Đustebek, Jasmina B., Cvetićanin, Jelena M., Veličković, Suzana, Veljković, Miomir V., Bokorov, M., Babić-Stojić, Branka S., Nešković, Olivera M., "Methods of purification and characterization of carbon nanotubes" in Journal of Optoelectronics and Advanced Materials, 8, no. 4 (2006):1631-1634,
https://hdl.handle.net/21.15107/rcub_vinar_3065 .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Đorđević, Vesna R.
AU  - Cvetićanin, Jelena M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Nešković, Olivera M.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3102
AB  - Molecules of LinX (n = 2,3; X = Cl, Br, I) were examined with a magnetic sector mass spectrometer by surface ionization using a triple rhenium filament impregnated with fullerene (C-60). The ionization energies obtained for Li2Cl, Li2Br and Li2I Molecules are 3.8 +/- 0.1, 3.9 +/- 0.1 and 4.0 +/- 0.1 eV. respectively. The first ionization energy of Li2Cl is documented, while there are no literature data for the ionization energies of Li2Br and Li2I. The molecules of Li3Cl, Li3Br and Li3I were detected experimentally for the first time with ionization energies of 4.0 +/- 0.1, 4.1 +/- 0.1 and 4.1 +/- 0.1 eV, respectively. The ionization energies of LinX (n = 2, 3; X = Cl, Br, I) are in correlation with the theoretical prediction of their hyperlithiated configurations. Copyright (c) 2006 John Wiley and Sons, Ltd.
T2  - Rapid Communications in Mass Spectrometry
T1  - Ionization energies of LinX(n=2,3; X=Cl,Br,I) molecules
VL  - 20
IS  - 20
SP  - 3151
EP  - 3153
DO  - 10.1002/rcm.2712
ER  - 

@article{
author = "Veličković, Suzana and Đorđević, Vesna R. and Cvetićanin, Jelena M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Nešković, Olivera M.",
year = "2006",
abstract = "Molecules of LinX (n = 2,3; X = Cl, Br, I) were examined with a magnetic sector mass spectrometer by surface ionization using a triple rhenium filament impregnated with fullerene (C-60). The ionization energies obtained for Li2Cl, Li2Br and Li2I Molecules are 3.8 +/- 0.1, 3.9 +/- 0.1 and 4.0 +/- 0.1 eV. respectively. The first ionization energy of Li2Cl is documented, while there are no literature data for the ionization energies of Li2Br and Li2I. The molecules of Li3Cl, Li3Br and Li3I were detected experimentally for the first time with ionization energies of 4.0 +/- 0.1, 4.1 +/- 0.1 and 4.1 +/- 0.1 eV, respectively. The ionization energies of LinX (n = 2, 3; X = Cl, Br, I) are in correlation with the theoretical prediction of their hyperlithiated configurations. Copyright (c) 2006 John Wiley and Sons, Ltd.",
journal = "Rapid Communications in Mass Spectrometry",
title = "Ionization energies of LinX(n=2,3; X=Cl,Br,I) molecules",
volume = "20",
number = "20",
pages = "3151-3153",
doi = "10.1002/rcm.2712"
}

Veličković, S., Đorđević, V. R., Cvetićanin, J. M., Đustebek, J. B., Veljković, M. V.,& Nešković, O. M.. (2006). Ionization energies of LinX(n=2,3; X=Cl,Br,I) molecules. in Rapid Communications in Mass Spectrometry, 20(20), 3151-3153.
https://doi.org/10.1002/rcm.2712

Veličković S, Đorđević VR, Cvetićanin JM, Đustebek JB, Veljković MV, Nešković OM. Ionization energies of LinX(n=2,3; X=Cl,Br,I) molecules. in Rapid Communications in Mass Spectrometry. 2006;20(20):3151-3153.
doi:10.1002/rcm.2712 .

Veličković, Suzana, Đorđević, Vesna R., Cvetićanin, Jelena M., Đustebek, Jasmina B., Veljković, Miomir V., Nešković, Olivera M., "Ionization energies of LinX(n=2,3; X=Cl,Br,I) molecules" in Rapid Communications in Mass Spectrometry, 20, no. 20 (2006):3151-3153,
https://doi.org/10.1002/rcm.2712 . .

TY  - JOUR
AU  - Cvetićanin, Jelena M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
AU  - Đorđević, Vesna R.
AU  - Nešković, Olivera M.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3106
AB  - In this work we have studied the Li/C-60, Li/C-70, (99)mTc/C-60, (TC)-T-99/C-70, Gd/C-60, Gd/C-70, Nd/C-60, Nd/C-70, Y/C-60 and Y/C-70 systems by surface ionization mass spectrometry and investigated a possibility of the formation of endohedral fullerenes. Using the ion implantation technique (introducing negatively charged fullerene into a low temperature lithium, technetium, gadolinium, neodymium or yttrium plasma column by a strong axial magnetic field), the endohedral fullerenes Li congruent to C-60, Li congruent to C-70, Li-2 congruent to C-70, Tc-99m congruent to C-60, Tc-99m congruent to C-70, Gd congruent to C-60, Nd congruent to C-60, Y congruent to C-60, Gd congruent to C-70, Nd congruent to C-70 and Y congruent to C-70 have been produced and ionization energies were measured. Their existence was demonstrated through the high sensitivity, magnetic mass spectrometer (TIMS- thermal ionization mass spectrometer). These metallofullerenes were identified as stable molecules. The reaction of the obtained endohedral fullerenes with oxygen compounds (H2O, O-2 and N2O) has also been investigated. The result showed that these metallofullerenes are very inert to all of these gas phase oxygen-rich molecules, leading support to the endohedral structure of the metallofullerenes. Observed ionization energies for Li congruent to C-60, Li congruent to C-70, Li-2 congruent to C-70, Tc-99m congruent to C-60, Tc-99m congruent to C-70, Gd congruent to C-60, Nd congruent to C-60, Y congruent to C-60, Gd congruent to C-70, Nd congruent to C-70 and Y congruent to C-70 were 5.9eV, 5.1eV, 5.3eV, 5.1eV, 5.3ev, 6.2eV, 6.5eV, 6.6eV, 6.4eV, 6.5eV and 6.7eV, respectively.
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Endohedral fullerenes of different elements
VL  - 8
IS  - 5
SP  - 1892
EP  - 1894
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3106
ER  - 

@article{
author = "Cvetićanin, Jelena M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Veličković, Suzana and Đorđević, Vesna R. and Nešković, Olivera M.",
year = "2006",
abstract = "In this work we have studied the Li/C-60, Li/C-70, (99)mTc/C-60, (TC)-T-99/C-70, Gd/C-60, Gd/C-70, Nd/C-60, Nd/C-70, Y/C-60 and Y/C-70 systems by surface ionization mass spectrometry and investigated a possibility of the formation of endohedral fullerenes. Using the ion implantation technique (introducing negatively charged fullerene into a low temperature lithium, technetium, gadolinium, neodymium or yttrium plasma column by a strong axial magnetic field), the endohedral fullerenes Li congruent to C-60, Li congruent to C-70, Li-2 congruent to C-70, Tc-99m congruent to C-60, Tc-99m congruent to C-70, Gd congruent to C-60, Nd congruent to C-60, Y congruent to C-60, Gd congruent to C-70, Nd congruent to C-70 and Y congruent to C-70 have been produced and ionization energies were measured. Their existence was demonstrated through the high sensitivity, magnetic mass spectrometer (TIMS- thermal ionization mass spectrometer). These metallofullerenes were identified as stable molecules. The reaction of the obtained endohedral fullerenes with oxygen compounds (H2O, O-2 and N2O) has also been investigated. The result showed that these metallofullerenes are very inert to all of these gas phase oxygen-rich molecules, leading support to the endohedral structure of the metallofullerenes. Observed ionization energies for Li congruent to C-60, Li congruent to C-70, Li-2 congruent to C-70, Tc-99m congruent to C-60, Tc-99m congruent to C-70, Gd congruent to C-60, Nd congruent to C-60, Y congruent to C-60, Gd congruent to C-70, Nd congruent to C-70 and Y congruent to C-70 were 5.9eV, 5.1eV, 5.3eV, 5.1eV, 5.3ev, 6.2eV, 6.5eV, 6.6eV, 6.4eV, 6.5eV and 6.7eV, respectively.",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Endohedral fullerenes of different elements",
volume = "8",
number = "5",
pages = "1892-1894",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3106"
}

Cvetićanin, J. M., Đustebek, J. B., Veljković, M. V., Veličković, S., Đorđević, V. R.,& Nešković, O. M.. (2006). Endohedral fullerenes of different elements. in Journal of Optoelectronics and Advanced Materials, 8(5), 1892-1894.
https://hdl.handle.net/21.15107/rcub_vinar_3106

Cvetićanin JM, Đustebek JB, Veljković MV, Veličković S, Đorđević VR, Nešković OM. Endohedral fullerenes of different elements. in Journal of Optoelectronics and Advanced Materials. 2006;8(5):1892-1894.
https://hdl.handle.net/21.15107/rcub_vinar_3106 .

Cvetićanin, Jelena M., Đustebek, Jasmina B., Veljković, Miomir V., Veličković, Suzana, Đorđević, Vesna R., Nešković, Olivera M., "Endohedral fullerenes of different elements" in Journal of Optoelectronics and Advanced Materials, 8, no. 5 (2006):1892-1894,
https://hdl.handle.net/21.15107/rcub_vinar_3106 .

TY  - JOUR
AU  - Perić-Grujić, Aleksandra A.
AU  - Vasiljevic, Tatjana M.
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Laušević, Zoran
AU  - Laugevic, Mila D.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3116
AB  - The effects of boron and phosphorus incorporation in phenolic resin precursor to the oxidation resistance of glassy carbon have been studied. In order to reveal the nature and composition of the oxygen complexes formed at the surface of doped glassy carbon, under controlled atmosphere, the surface of the samples was cleaned under vacuum up to 1273 K. Specific functional groups, subsequently formed under dry CO2 or O-2 atmosphere on the surface of boron-doped and phosphorus-doped glassy carbon samples, were examined using the temperature-programmed desorption method combined with mass spectrometric analysis. Characterization of surface properties of undoped and doped samples has shown that in the presence of either boron or phosphorus heteroatoms, a lower amount of oxygen complexes formed after CO2 exposure, while, typically, higher amount of oxygen complexes formed after O-2 exposure. It has been concluded that the surface of undoped glassy carbon has a greater affinity towards CO2, while in the presence of either boron or phosphorus heteroatoms, the glassy carbon surface affinity becomes greater towards O-2, under experimental conditions.
T2  - Bulletin of Materials Science
T1  - Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon
VL  - 29
IS  - 5
SP  - 467
EP  - 473
DO  - 10.1007/BF02914077
ER  - 

@article{
author = "Perić-Grujić, Aleksandra A. and Vasiljevic, Tatjana M. and Nešković, Olivera M. and Veljković, Miomir V. and Laušević, Zoran and Laugevic, Mila D.",
year = "2006",
abstract = "The effects of boron and phosphorus incorporation in phenolic resin precursor to the oxidation resistance of glassy carbon have been studied. In order to reveal the nature and composition of the oxygen complexes formed at the surface of doped glassy carbon, under controlled atmosphere, the surface of the samples was cleaned under vacuum up to 1273 K. Specific functional groups, subsequently formed under dry CO2 or O-2 atmosphere on the surface of boron-doped and phosphorus-doped glassy carbon samples, were examined using the temperature-programmed desorption method combined with mass spectrometric analysis. Characterization of surface properties of undoped and doped samples has shown that in the presence of either boron or phosphorus heteroatoms, a lower amount of oxygen complexes formed after CO2 exposure, while, typically, higher amount of oxygen complexes formed after O-2 exposure. It has been concluded that the surface of undoped glassy carbon has a greater affinity towards CO2, while in the presence of either boron or phosphorus heteroatoms, the glassy carbon surface affinity becomes greater towards O-2, under experimental conditions.",
journal = "Bulletin of Materials Science",
title = "Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon",
volume = "29",
number = "5",
pages = "467-473",
doi = "10.1007/BF02914077"
}

Perić-Grujić, A. A., Vasiljevic, T. M., Nešković, O. M., Veljković, M. V., Laušević, Z.,& Laugevic, M. D.. (2006). Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon. in Bulletin of Materials Science, 29(5), 467-473.
https://doi.org/10.1007/BF02914077

Perić-Grujić AA, Vasiljevic TM, Nešković OM, Veljković MV, Laušević Z, Laugevic MD. Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon. in Bulletin of Materials Science. 2006;29(5):467-473.
doi:10.1007/BF02914077 .

Perić-Grujić, Aleksandra A., Vasiljevic, Tatjana M., Nešković, Olivera M., Veljković, Miomir V., Laušević, Zoran, Laugevic, Mila D., "Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon" in Bulletin of Materials Science, 29, no. 5 (2006):467-473,
https://doi.org/10.1007/BF02914077 . .

TY  - CONF
AU  - Đustebek, Jasmina B.
AU  - Cvetićanin, Jelena M.
AU  - Đorđević, Vesna R.
AU  - Veličković, Sava J.
AU  - Veljković, Miomir V.
AU  - Nešković, Olivera M.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9449
AB  - Mass spectral studies (both TIMS – thermal ionization and MALDI TOF – matrixassisted laser desorption time-of-flight mass spectrometry) of the endohedral metallofullerenes, 99mTc@C60 and 99mTc@C70, provided detailed structural and reactivity information about these unusual species. MS experiment revealed that both fullerenes and endohedral metallofullerenes fragment by multiple C2 loss. However, a difference in the terminal fragmentation products was observed for metallofullerene relative to C60, suggesting that the encapsulation metal strongly impacts the fragmentation product. Singly charged cations of the metallofullerenes (M@Cn + ) were completely unreactive in the gas phase with oxygenated compounds such as ethylene oxide: however, the corresponding neutral species appear to react readily with oxygenated species. Collisional dissociation of the ionized endohedral fullerenes listed above revealed multiple C2 loss (either as sequential C2 loss or larger C2n eliminations) to generate similar terminal fragmentation products, which might be predicted due to the similar ionic radii of the encapsulated metals. The observed ionization energies of endohedral molecules were, 5.1 ± 0.1 eV and 5.3 ± 0.1 eV, respectively.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry
T1  - Tims and maldi tof of endohedral 99mTc@C60 metallofullerene
SP  - 504
EP  - 506
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9449
ER  - 

@conference{
author = "Đustebek, Jasmina B. and Cvetićanin, Jelena M. and Đorđević, Vesna R. and Veličković, Sava J. and Veljković, Miomir V. and Nešković, Olivera M.",
year = "2006",
abstract = "Mass spectral studies (both TIMS – thermal ionization and MALDI TOF – matrixassisted laser desorption time-of-flight mass spectrometry) of the endohedral metallofullerenes, 99mTc@C60 and 99mTc@C70, provided detailed structural and reactivity information about these unusual species. MS experiment revealed that both fullerenes and endohedral metallofullerenes fragment by multiple C2 loss. However, a difference in the terminal fragmentation products was observed for metallofullerene relative to C60, suggesting that the encapsulation metal strongly impacts the fragmentation product. Singly charged cations of the metallofullerenes (M@Cn + ) were completely unreactive in the gas phase with oxygenated compounds such as ethylene oxide: however, the corresponding neutral species appear to react readily with oxygenated species. Collisional dissociation of the ionized endohedral fullerenes listed above revealed multiple C2 loss (either as sequential C2 loss or larger C2n eliminations) to generate similar terminal fragmentation products, which might be predicted due to the similar ionic radii of the encapsulated metals. The observed ionization energies of endohedral molecules were, 5.1 ± 0.1 eV and 5.3 ± 0.1 eV, respectively.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry",
title = "Tims and maldi tof of endohedral 99mTc@C60 metallofullerene",
pages = "504-506",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9449"
}

Đustebek, J. B., Cvetićanin, J. M., Đorđević, V. R., Veličković, S. J., Veljković, M. V.,& Nešković, O. M.. (2006). Tims and maldi tof of endohedral 99mTc@C60 metallofullerene. in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry
Society of Physical Chemists of Serbia., 504-506.
https://hdl.handle.net/21.15107/rcub_vinar_9449

Đustebek JB, Cvetićanin JM, Đorđević VR, Veličković SJ, Veljković MV, Nešković OM. Tims and maldi tof of endohedral 99mTc@C60 metallofullerene. in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry. 2006;:504-506.
https://hdl.handle.net/21.15107/rcub_vinar_9449 .

Đustebek, Jasmina B., Cvetićanin, Jelena M., Đorđević, Vesna R., Veličković, Sava J., Veljković, Miomir V., Nešković, Olivera M., "Tims and maldi tof of endohedral 99mTc@C60 metallofullerene" in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry (2006):504-506,
https://hdl.handle.net/21.15107/rcub_vinar_9449 .

TY  - JOUR
AU  - Veljković, Miomir V.
AU  - Nešković, Olivera M.
AU  - Ivetić, Tamara B.
AU  - Veličković, Suzana
AU  - Maksin, Tatjana N.
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6502
UR  - https://plus.sr.cobiss.net/opac7/bib/1027650997
AB  - A new diatomic molecule-containing endohedral fullerenes were prepared by ion implantation technique (introducing negatively charged C-70 into a low temperature lithium plasma column by a strong exial magnetic field). The species prepared were Li"C-70 and Li-2"C-70 and ionized by surface ionization. Their existance was demonstrated through high sensitivity, magnetic mass spectrometer. The corresponding endohedral ions undergo the Rice shrinkwrap mechanism: a mass -analyzed ion spectrum demonstrates the loss of a C-2 unit from the cage. The observed ionization energies of endohedral molecules were 5.1 for all 0.1 eV and 5.3 for all 0.1 eV, respectively.
T2  - Materials Science Forum
T1  - Endohedral encapsulation of lithium in C-70
VL  - 480
SP  - 351
EP  - 354
DO  - 10.4028/www.scientific.net/MSF.480-481.351
ER  - 

@article{
author = "Veljković, Miomir V. and Nešković, Olivera M. and Ivetić, Tamara B. and Veličković, Suzana and Maksin, Tatjana N.",
year = "2005",
abstract = "A new diatomic molecule-containing endohedral fullerenes were prepared by ion implantation technique (introducing negatively charged C-70 into a low temperature lithium plasma column by a strong exial magnetic field). The species prepared were Li"C-70 and Li-2"C-70 and ionized by surface ionization. Their existance was demonstrated through high sensitivity, magnetic mass spectrometer. The corresponding endohedral ions undergo the Rice shrinkwrap mechanism: a mass -analyzed ion spectrum demonstrates the loss of a C-2 unit from the cage. The observed ionization energies of endohedral molecules were 5.1 for all 0.1 eV and 5.3 for all 0.1 eV, respectively.",
journal = "Materials Science Forum",
title = "Endohedral encapsulation of lithium in C-70",
volume = "480",
pages = "351-354",
doi = "10.4028/www.scientific.net/MSF.480-481.351"
}

Veljković, M. V., Nešković, O. M., Ivetić, T. B., Veličković, S.,& Maksin, T. N.. (2005). Endohedral encapsulation of lithium in C-70. in Materials Science Forum, 480, 351-354.
https://doi.org/10.4028/www.scientific.net/MSF.480-481.351

Veljković MV, Nešković OM, Ivetić TB, Veličković S, Maksin TN. Endohedral encapsulation of lithium in C-70. in Materials Science Forum. 2005;480:351-354.
doi:10.4028/www.scientific.net/MSF.480-481.351 .

Veljković, Miomir V., Nešković, Olivera M., Ivetić, Tamara B., Veličković, Suzana, Maksin, Tatjana N., "Endohedral encapsulation of lithium in C-70" in Materials Science Forum, 480 (2005):351-354,
https://doi.org/10.4028/www.scientific.net/MSF.480-481.351 . .

TY  - JOUR
AU  - Veljković, Miomir V.
AU  - Nešković, Olivera M.
AU  - Deric, A
AU  - Veličković, Suzana
AU  - Šipka, V.
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6525
AB  - A growing number of recent publications on clusters reflect a tremendous interest in these particles. These studies reveal new fundamental physical and chemical aspects of matter. Clusters are called the fifth state of matter: liquid, solid, cluster, gas and plasma. In this work, a carbon cluster was generated by a spark cluster source and detected by single focusing mass spectrometer in situ. We examined the effects of cluster source parameters on the generation of carbon cluster and report our initial results. This method should be useful for studying the mechanism of fullerene formation. In the case when carbon clusters generated in plasma arc are carried by the Ar or H-2 gas flow downstream through a vacuum chamber to the ion source of mass spectrometer, we obtained a small binary carbon cluster C28H4 (hydrogenated fullerene). The empty fullerene is tetravalent and strongly binds four hydrogen atoms, which significantly weakens two different sets of bonds and leads to an open-shell electronic structure. Conclusion is that endohedral C28H4 are hypervalent. We have demonstrated how in situ mass spectrometry has led to the rapid development of an important branch of synthetic fullerene chemistry that has yielded many new small fullerenes and related derivatives with novel structures and properties. The impact of mass spectrometry on the synthesis of fullerene derivatives is the subject of this paper. Significantly, a large fraction of products could be condensed on a specially designed collection plate, which allows further spectroscopic characterization of new derivatives.
T2  - Materials Science Forum
T1  - Hypervalent molecular cluster: C28H4
VL  - 494
SP  - 181
EP  - 186
DO  - 10.4028/www.scientific.net/MSF.494.181
ER  - 

@article{
author = "Veljković, Miomir V. and Nešković, Olivera M. and Deric, A and Veličković, Suzana and Šipka, V.",
year = "2005",
abstract = "A growing number of recent publications on clusters reflect a tremendous interest in these particles. These studies reveal new fundamental physical and chemical aspects of matter. Clusters are called the fifth state of matter: liquid, solid, cluster, gas and plasma. In this work, a carbon cluster was generated by a spark cluster source and detected by single focusing mass spectrometer in situ. We examined the effects of cluster source parameters on the generation of carbon cluster and report our initial results. This method should be useful for studying the mechanism of fullerene formation. In the case when carbon clusters generated in plasma arc are carried by the Ar or H-2 gas flow downstream through a vacuum chamber to the ion source of mass spectrometer, we obtained a small binary carbon cluster C28H4 (hydrogenated fullerene). The empty fullerene is tetravalent and strongly binds four hydrogen atoms, which significantly weakens two different sets of bonds and leads to an open-shell electronic structure. Conclusion is that endohedral C28H4 are hypervalent. We have demonstrated how in situ mass spectrometry has led to the rapid development of an important branch of synthetic fullerene chemistry that has yielded many new small fullerenes and related derivatives with novel structures and properties. The impact of mass spectrometry on the synthesis of fullerene derivatives is the subject of this paper. Significantly, a large fraction of products could be condensed on a specially designed collection plate, which allows further spectroscopic characterization of new derivatives.",
journal = "Materials Science Forum",
title = "Hypervalent molecular cluster: C28H4",
volume = "494",
pages = "181-186",
doi = "10.4028/www.scientific.net/MSF.494.181"
}

Veljković, M. V., Nešković, O. M., Deric, A., Veličković, S.,& Šipka, V.. (2005). Hypervalent molecular cluster: C28H4. in Materials Science Forum, 494, 181-186.
https://doi.org/10.4028/www.scientific.net/MSF.494.181

Veljković MV, Nešković OM, Deric A, Veličković S, Šipka V. Hypervalent molecular cluster: C28H4. in Materials Science Forum. 2005;494:181-186.
doi:10.4028/www.scientific.net/MSF.494.181 .

Veljković, Miomir V., Nešković, Olivera M., Deric, A, Veličković, Suzana, Šipka, V., "Hypervalent molecular cluster: C28H4" in Materials Science Forum, 494 (2005):181-186,
https://doi.org/10.4028/www.scientific.net/MSF.494.181 . .

TY  - JOUR
AU  - Šipka, V.
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6526
AB  - Matrix-assisted laser desorption/ionization (MALDI) coupled with reflectron time-off-light mass spectrometry was applied to the analysis of fullerenes (C-60 and C-70). This investigation included the screening of three different compounds regarding their suitability as MALDI matrices. It has been found that the performance of alpha-cyano-4-hydroxycinnamic acid (CHCA), currently one of the most universally used matrices in MALDI analyses, is exceeded by some of these materials. In the negative ion-mode, excellent performance has been achieved using 2-[(2E)-3-(4-tertbutylphenyl)-2-methylprop-2-enylidene] malonitrile (DCTB). These matrixes should efficiently absorb at commonly used laser wavelength (typically for a 337-nm nitrogen laser) and form homogeneous microcrystalline solids with analyte molecules. The soft ionization technique affords little to no fragmentation of analyte. Carbon nanotubes, prepared by an are discharge method, were investigated as the third matrix. It was observed that the carbon nanotube layer as a matrix provides high detection sensitivity and mass resolution of fullerenes with eliminating matrix ion interference.
T2  - Materials Science Forum
T1  - Carbon nanotubes as assisted matrix for fullerenes
VL  - 494
SP  - 187
EP  - 192
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6526
ER  - 

@article{
author = "Šipka, V. and Nešković, Olivera M. and Veljković, Miomir V. and Veličković, Suzana",
year = "2005",
abstract = "Matrix-assisted laser desorption/ionization (MALDI) coupled with reflectron time-off-light mass spectrometry was applied to the analysis of fullerenes (C-60 and C-70). This investigation included the screening of three different compounds regarding their suitability as MALDI matrices. It has been found that the performance of alpha-cyano-4-hydroxycinnamic acid (CHCA), currently one of the most universally used matrices in MALDI analyses, is exceeded by some of these materials. In the negative ion-mode, excellent performance has been achieved using 2-[(2E)-3-(4-tertbutylphenyl)-2-methylprop-2-enylidene] malonitrile (DCTB). These matrixes should efficiently absorb at commonly used laser wavelength (typically for a 337-nm nitrogen laser) and form homogeneous microcrystalline solids with analyte molecules. The soft ionization technique affords little to no fragmentation of analyte. Carbon nanotubes, prepared by an are discharge method, were investigated as the third matrix. It was observed that the carbon nanotube layer as a matrix provides high detection sensitivity and mass resolution of fullerenes with eliminating matrix ion interference.",
journal = "Materials Science Forum",
title = "Carbon nanotubes as assisted matrix for fullerenes",
volume = "494",
pages = "187-192",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6526"
}

Šipka, V., Nešković, O. M., Veljković, M. V.,& Veličković, S.. (2005). Carbon nanotubes as assisted matrix for fullerenes. in Materials Science Forum, 494, 187-192.
https://hdl.handle.net/21.15107/rcub_vinar_6526

Šipka V, Nešković OM, Veljković MV, Veličković S. Carbon nanotubes as assisted matrix for fullerenes. in Materials Science Forum. 2005;494:187-192.
https://hdl.handle.net/21.15107/rcub_vinar_6526 .

Šipka, V., Nešković, Olivera M., Veljković, Miomir V., Veličković, Suzana, "Carbon nanotubes as assisted matrix for fullerenes" in Materials Science Forum, 494 (2005):187-192,
https://hdl.handle.net/21.15107/rcub_vinar_6526 .

TY  - CONF
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Šipka, V.
AU  - Veličković, Suzana
AU  - Đerić, A.
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9484
AB  - Mass spectral studies (both TIMS – thermal ionization and MALDI TOF – matrix-assisted laser desorption time-of-flight mass spectrometry) of the endohedral metallofullerenes, Li@C60,Li2C70 and 99mTc@C70,provided detailed structural and reactivity information about these unusual species. MS experiment revealed that both fullerenes and endohedral metallofullerenes fragment by multiple C2 loss. However, a difference in the terminal fragmentation products was observed for metallofullerene relative to C60, suggesting that the encapsulation metal strongly impactsthe fragmentation product. Singly charged cations of the metallofullerenes (M@Cn + ) were completely unreactive in the gas phase with oxygenated compounds such as ethylene oxide: however, the corresponding neutral species appear to react readily with oxygenated species. Collisional dissociation of the ionized endohedral fullerenes listed above revealed multiple C2 loss (either as sequential C2 loss or larger C2n eliminations) to generate similar terminal fragmentation products, which might be predicted due to the similar ionic radii of the encapsulated metals. The observed ionization energies of endohedral molecules were 5.9 ± 0.1 eV, 5.3 ± 0.1 eV and 5.7 ± 0.1 eV, respectively.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry
T1  - Tims and maldi tof of endohedral metallofullerenes
VL  - 1
SP  - 152
EP  - 154
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9484
ER  - 

@conference{
author = "Nešković, Olivera M. and Veljković, Miomir V. and Šipka, V. and Veličković, Suzana and Đerić, A.",
year = "2004",
abstract = "Mass spectral studies (both TIMS – thermal ionization and MALDI TOF – matrix-assisted laser desorption time-of-flight mass spectrometry) of the endohedral metallofullerenes, Li@C60,Li2C70 and 99mTc@C70,provided detailed structural and reactivity information about these unusual species. MS experiment revealed that both fullerenes and endohedral metallofullerenes fragment by multiple C2 loss. However, a difference in the terminal fragmentation products was observed for metallofullerene relative to C60, suggesting that the encapsulation metal strongly impactsthe fragmentation product. Singly charged cations of the metallofullerenes (M@Cn + ) were completely unreactive in the gas phase with oxygenated compounds such as ethylene oxide: however, the corresponding neutral species appear to react readily with oxygenated species. Collisional dissociation of the ionized endohedral fullerenes listed above revealed multiple C2 loss (either as sequential C2 loss or larger C2n eliminations) to generate similar terminal fragmentation products, which might be predicted due to the similar ionic radii of the encapsulated metals. The observed ionization energies of endohedral molecules were 5.9 ± 0.1 eV, 5.3 ± 0.1 eV and 5.7 ± 0.1 eV, respectively.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry",
title = "Tims and maldi tof of endohedral metallofullerenes",
volume = "1",
pages = "152-154",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9484"
}

Nešković, O. M., Veljković, M. V., Šipka, V., Veličković, S.,& Đerić, A.. (2004). Tims and maldi tof of endohedral metallofullerenes. in Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry
Society of Physical Chemists of Serbia., 1, 152-154.
https://hdl.handle.net/21.15107/rcub_vinar_9484

Nešković OM, Veljković MV, Šipka V, Veličković S, Đerić A. Tims and maldi tof of endohedral metallofullerenes. in Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry. 2004;1:152-154.
https://hdl.handle.net/21.15107/rcub_vinar_9484 .

Nešković, Olivera M., Veljković, Miomir V., Šipka, V., Veličković, Suzana, Đerić, A., "Tims and maldi tof of endohedral metallofullerenes" in Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry, 1 (2004):152-154,
https://hdl.handle.net/21.15107/rcub_vinar_9484 .