TY  - JOUR
AU  - Milovanović, Dubravka
AU  - Rajčić, Boris
AU  - Ranković, Dragan
AU  - Stankov, Biljana
AU  - Čekada, Miha
AU  - Ciganović, Jovan
AU  - Đurđević-Milošević, Dragica
AU  - Stević, Zoran
AU  - Kuzmanović, Miroslav
AU  - Šibalija, Tatjana
AU  - Petronić, Sanja
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12723
AB  - This paper presents a study and comparison of surface effects induced by picosecond and nanosecond laser modification of a Ti6Al4V alloy surface under different ambient conditions: air and argon- and nitrogen-rich atmospheres. Detailed surface characterization was performed for all experimental conditions. Damage threshold fluences for picosecond and nanosecond laser irradiation in all three ambient conditions were determined. The observed surface features were a resolidified pool of molten material, craters, hydrodynamic effects and parallel periodic surface structures. Laser-induced periodic surface structures are formed by multi-mode-beam nanosecond laser action and picosecond laser action. Crown-like structures at crater rims are specific features for picosecond Nd:YAG laser action in argon-rich ambient conditions. Elemental analysis of the surfaces indicated nitride compound formation only in the nitrogen-rich ambient conditions. The constituents of the formed plasma were also investigated. Exploring the impact of process control parameters on output responses has been undertaken within the context of laser modification under different environmental conditions. Parametric optimization of the nanosecond laser modification was carried out by implementing an advanced method based on Taguchi’s parametric design and multivariate statistical techniques, and optimal settings are proposed for each atmosphere.
T2  - Micromachines
T1  - Microstructure Formations Resulting from Nanosecond and Picosecond Laser Irradiation of a Ti-Based Alloy under Controlled Atmospheric Conditions and Optimization of the Irradiation Process
VL  - 15
IS  - 1
SP  - 5
DO  - 10.3390/mi15010005
ER  - 

@article{
author = "Milovanović, Dubravka and Rajčić, Boris and Ranković, Dragan and Stankov, Biljana and Čekada, Miha and Ciganović, Jovan and Đurđević-Milošević, Dragica and Stević, Zoran and Kuzmanović, Miroslav and Šibalija, Tatjana and Petronić, Sanja",
year = "2024",
abstract = "This paper presents a study and comparison of surface effects induced by picosecond and nanosecond laser modification of a Ti6Al4V alloy surface under different ambient conditions: air and argon- and nitrogen-rich atmospheres. Detailed surface characterization was performed for all experimental conditions. Damage threshold fluences for picosecond and nanosecond laser irradiation in all three ambient conditions were determined. The observed surface features were a resolidified pool of molten material, craters, hydrodynamic effects and parallel periodic surface structures. Laser-induced periodic surface structures are formed by multi-mode-beam nanosecond laser action and picosecond laser action. Crown-like structures at crater rims are specific features for picosecond Nd:YAG laser action in argon-rich ambient conditions. Elemental analysis of the surfaces indicated nitride compound formation only in the nitrogen-rich ambient conditions. The constituents of the formed plasma were also investigated. Exploring the impact of process control parameters on output responses has been undertaken within the context of laser modification under different environmental conditions. Parametric optimization of the nanosecond laser modification was carried out by implementing an advanced method based on Taguchi’s parametric design and multivariate statistical techniques, and optimal settings are proposed for each atmosphere.",
journal = "Micromachines",
title = "Microstructure Formations Resulting from Nanosecond and Picosecond Laser Irradiation of a Ti-Based Alloy under Controlled Atmospheric Conditions and Optimization of the Irradiation Process",
volume = "15",
number = "1",
pages = "5",
doi = "10.3390/mi15010005"
}

Milovanović, D., Rajčić, B., Ranković, D., Stankov, B., Čekada, M., Ciganović, J., Đurđević-Milošević, D., Stević, Z., Kuzmanović, M., Šibalija, T.,& Petronić, S.. (2024). Microstructure Formations Resulting from Nanosecond and Picosecond Laser Irradiation of a Ti-Based Alloy under Controlled Atmospheric Conditions and Optimization of the Irradiation Process. in Micromachines, 15(1), 5.
https://doi.org/10.3390/mi15010005

Milovanović D, Rajčić B, Ranković D, Stankov B, Čekada M, Ciganović J, Đurđević-Milošević D, Stević Z, Kuzmanović M, Šibalija T, Petronić S. Microstructure Formations Resulting from Nanosecond and Picosecond Laser Irradiation of a Ti-Based Alloy under Controlled Atmospheric Conditions and Optimization of the Irradiation Process. in Micromachines. 2024;15(1):5.
doi:10.3390/mi15010005 .

Milovanović, Dubravka, Rajčić, Boris, Ranković, Dragan, Stankov, Biljana, Čekada, Miha, Ciganović, Jovan, Đurđević-Milošević, Dragica, Stević, Zoran, Kuzmanović, Miroslav, Šibalija, Tatjana, Petronić, Sanja, "Microstructure Formations Resulting from Nanosecond and Picosecond Laser Irradiation of a Ti-Based Alloy under Controlled Atmospheric Conditions and Optimization of the Irradiation Process" in Micromachines, 15, no. 1 (2024):5,
https://doi.org/10.3390/mi15010005 . .

TY  - JOUR
AU  - Rajčić, Boris
AU  - Šibalija, Tatjana
AU  - Nikolić, Vladimir M.
AU  - Čekada, Miha
AU  - Savović, Jelena
AU  - Petronić, Sanja
AU  - Milovanović, Dubravka
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10659
AB  - In this experimental study, picosecond laser treatment was performed on a nickel-based superalloy Nimonic 263, aiming to investigate the surface effects induced by irradiation in different atmospheric conditions and, concerning changes in surface composition, regarding the possibility for improvement of its functionality. Besides the varying laser parameters, such as a number of pulses and pulse energy, environmental conditions are also varied. All surface modifications were carried out in standard laboratory conditions and a nitrogen- and argon-rich atmosphere. The resulting topography effects depend on the specific laser treatment and could be categorized as increased roughness, crater formation, and formation of the laser-induced periodic surface structures (LIPSS). Changes in the chemical surface composition are distinguished as the potential formation of the protective oxides/nitrides on the sample surface. Numerous characterization techniques analyse the resulting effects on the topography and surface parameters. The multi-response parametric optimization of the picosecond laser process was performed using an advanced statistical method based on Taguchi’s robust parameter design. Finally, the optimal parameter conditions for Nimonic 263 modification are suggested.
T2  - Materials
T1  - Structural and Functional Picosecond Laser Modification of the Nimonic 263 Superalloy in Different Environmental Conditions and Optimization of the Irradiation Process
VL  - 16
IS  - 3
SP  - 1021
DO  - 10.3390/ma16031021
ER  - 

@article{
author = "Rajčić, Boris and Šibalija, Tatjana and Nikolić, Vladimir M. and Čekada, Miha and Savović, Jelena and Petronić, Sanja and Milovanović, Dubravka",
year = "2023",
abstract = "In this experimental study, picosecond laser treatment was performed on a nickel-based superalloy Nimonic 263, aiming to investigate the surface effects induced by irradiation in different atmospheric conditions and, concerning changes in surface composition, regarding the possibility for improvement of its functionality. Besides the varying laser parameters, such as a number of pulses and pulse energy, environmental conditions are also varied. All surface modifications were carried out in standard laboratory conditions and a nitrogen- and argon-rich atmosphere. The resulting topography effects depend on the specific laser treatment and could be categorized as increased roughness, crater formation, and formation of the laser-induced periodic surface structures (LIPSS). Changes in the chemical surface composition are distinguished as the potential formation of the protective oxides/nitrides on the sample surface. Numerous characterization techniques analyse the resulting effects on the topography and surface parameters. The multi-response parametric optimization of the picosecond laser process was performed using an advanced statistical method based on Taguchi’s robust parameter design. Finally, the optimal parameter conditions for Nimonic 263 modification are suggested.",
journal = "Materials",
title = "Structural and Functional Picosecond Laser Modification of the Nimonic 263 Superalloy in Different Environmental Conditions and Optimization of the Irradiation Process",
volume = "16",
number = "3",
pages = "1021",
doi = "10.3390/ma16031021"
}

Rajčić, B., Šibalija, T., Nikolić, V. M., Čekada, M., Savović, J., Petronić, S.,& Milovanović, D.. (2023). Structural and Functional Picosecond Laser Modification of the Nimonic 263 Superalloy in Different Environmental Conditions and Optimization of the Irradiation Process. in Materials, 16(3), 1021.
https://doi.org/10.3390/ma16031021

Rajčić B, Šibalija T, Nikolić VM, Čekada M, Savović J, Petronić S, Milovanović D. Structural and Functional Picosecond Laser Modification of the Nimonic 263 Superalloy in Different Environmental Conditions and Optimization of the Irradiation Process. in Materials. 2023;16(3):1021.
doi:10.3390/ma16031021 .

Rajčić, Boris, Šibalija, Tatjana, Nikolić, Vladimir M., Čekada, Miha, Savović, Jelena, Petronić, Sanja, Milovanović, Dubravka, "Structural and Functional Picosecond Laser Modification of the Nimonic 263 Superalloy in Different Environmental Conditions and Optimization of the Irradiation Process" in Materials, 16, no. 3 (2023):1021,
https://doi.org/10.3390/ma16031021 . .

TY  - JOUR
AU  - Milovanović, Dubravka S.
AU  - Rajčić, Boris
AU  - Petronić, Sanja
AU  - Radulović, Aleksandra
AU  - Radak, Bojan
AU  - Gaković, Biljana M.
AU  - Zamfirescu, Marian
AU  - Albu, Catalina
AU  - Savović, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10116
AB  - The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$and the incubation factor $$(\zeta )$$were also determined.
T2  - European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics
T1  - Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences
VL  - 76
IS  - 1
SP  - 2
DO  - 10.1140/epjd/s10053-021-00308-z
ER  - 

@article{
author = "Milovanović, Dubravka S. and Rajčić, Boris and Petronić, Sanja and Radulović, Aleksandra and Radak, Bojan and Gaković, Biljana M. and Zamfirescu, Marian and Albu, Catalina and Savović, Jelena",
year = "2022",
abstract = "The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$and the incubation factor $$(\zeta )$$were also determined.",
journal = "European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics",
title = "Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences",
volume = "76",
number = "1",
pages = "2",
doi = "10.1140/epjd/s10053-021-00308-z"
}

Milovanović, D. S., Rajčić, B., Petronić, S., Radulović, A., Radak, B., Gaković, B. M., Zamfirescu, M., Albu, C.,& Savović, J.. (2022). Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 76(1), 2.
https://doi.org/10.1140/epjd/s10053-021-00308-z

Milovanović DS, Rajčić B, Petronić S, Radulović A, Radak B, Gaković BM, Zamfirescu M, Albu C, Savović J. Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics. 2022;76(1):2.
doi:10.1140/epjd/s10053-021-00308-z .

Milovanović, Dubravka S., Rajčić, Boris, Petronić, Sanja, Radulović, Aleksandra, Radak, Bojan, Gaković, Biljana M., Zamfirescu, Marian, Albu, Catalina, Savović, Jelena, "Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences" in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 76, no. 1 (2022):2,
https://doi.org/10.1140/epjd/s10053-021-00308-z . .

TY  - CONF
AU  - Samolov, Aleksandra
AU  - Savić, Jasmina
AU  - Rajčić, Boris
AU  - Milovanović, Dubravka
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11783
AB  - Diffuse reflection as a feature of dyed coatings is important characteristic regarding camouflage protection analysis. In our laboratory practice, the need for diffuse reflection analysis of textile materials has appeared, recently. Therefore, astm e903-12 [1] method has been modified in order to be applicable for this type of materials. The measurements of diffuse reflection were conducted, in the military technical institute laboratory for textile, leather and shoes examination in belgrade, serbia, using the uv/vis/nir spectrophotometer uv 3600 from a japanese manufacturer shimadzu with an integrating sphere within wavelength area from 650 nm to 1000 nm. For the purpose of results analyses, uv probe programme package [2] was used. 10 measurements of spectralon (manufactured by labsphere®), which is used as a certified reflectance standard, were performed and obtained standard deviation was 0.07 %. Then control sample, a piece of a standard military cloth of serbian army, which has five color shades (light green, beige green, dark green, brown and black) was tested. Standard deviations were in range from 0.09% for black tone on 650 nm wavelength to 2.0% for light green tone on 1000 nm. The combine uncertainty for the method was ±2.0 %, which coincides with the above mentioned astm standard. In the end, comparative measurements of the same control sample for all five shades were performed in the “vinca” institute for nuclear sciences, department for physical chemistry, university of belgrade on lambda 35 perkin-elmer uv/vis/nir spectrophotometer. Moreover, the z score was calculated as well, and its values ranged from -0.71 to +0.71, which was satisfying regarding interlaboratory measurements rules. Overall results showed that this method is applicable for diffuse reflection measurements of textile materials.
C3  - AUTEX2019 : 19th World Textile Conference on Textiles at the Crossroads, the book of abstracts; June 11-15, Ghent, Belgium
T1  - Validation Estimation of Diffuse Reflection Method for Textile Materials Analysis
SP  - 217
EP  - 217
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11783
ER  - 

@conference{
author = "Samolov, Aleksandra and Savić, Jasmina and Rajčić, Boris and Milovanović, Dubravka",
year = "2019",
abstract = "Diffuse reflection as a feature of dyed coatings is important characteristic regarding camouflage protection analysis. In our laboratory practice, the need for diffuse reflection analysis of textile materials has appeared, recently. Therefore, astm e903-12 [1] method has been modified in order to be applicable for this type of materials. The measurements of diffuse reflection were conducted, in the military technical institute laboratory for textile, leather and shoes examination in belgrade, serbia, using the uv/vis/nir spectrophotometer uv 3600 from a japanese manufacturer shimadzu with an integrating sphere within wavelength area from 650 nm to 1000 nm. For the purpose of results analyses, uv probe programme package [2] was used. 10 measurements of spectralon (manufactured by labsphere®), which is used as a certified reflectance standard, were performed and obtained standard deviation was 0.07 %. Then control sample, a piece of a standard military cloth of serbian army, which has five color shades (light green, beige green, dark green, brown and black) was tested. Standard deviations were in range from 0.09% for black tone on 650 nm wavelength to 2.0% for light green tone on 1000 nm. The combine uncertainty for the method was ±2.0 %, which coincides with the above mentioned astm standard. In the end, comparative measurements of the same control sample for all five shades were performed in the “vinca” institute for nuclear sciences, department for physical chemistry, university of belgrade on lambda 35 perkin-elmer uv/vis/nir spectrophotometer. Moreover, the z score was calculated as well, and its values ranged from -0.71 to +0.71, which was satisfying regarding interlaboratory measurements rules. Overall results showed that this method is applicable for diffuse reflection measurements of textile materials.",
journal = "AUTEX2019 : 19th World Textile Conference on Textiles at the Crossroads, the book of abstracts; June 11-15, Ghent, Belgium",
title = "Validation Estimation of Diffuse Reflection Method for Textile Materials Analysis",
pages = "217-217",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11783"
}

Samolov, A., Savić, J., Rajčić, B.,& Milovanović, D.. (2019). Validation Estimation of Diffuse Reflection Method for Textile Materials Analysis. in AUTEX2019 : 19th World Textile Conference on Textiles at the Crossroads, the book of abstracts; June 11-15, Ghent, Belgium, 217-217.
https://hdl.handle.net/21.15107/rcub_vinar_11783

Samolov A, Savić J, Rajčić B, Milovanović D. Validation Estimation of Diffuse Reflection Method for Textile Materials Analysis. in AUTEX2019 : 19th World Textile Conference on Textiles at the Crossroads, the book of abstracts; June 11-15, Ghent, Belgium. 2019;:217-217.
https://hdl.handle.net/21.15107/rcub_vinar_11783 .

Samolov, Aleksandra, Savić, Jasmina, Rajčić, Boris, Milovanović, Dubravka, "Validation Estimation of Diffuse Reflection Method for Textile Materials Analysis" in AUTEX2019 : 19th World Textile Conference on Textiles at the Crossroads, the book of abstracts; June 11-15, Ghent, Belgium (2019):217-217,
https://hdl.handle.net/21.15107/rcub_vinar_11783 .

TY  - JOUR
AU  - Veljković, Filip M.
AU  - Vurdelja, Borislava D.
AU  - Rajčić, Boris
AU  - Veličković, Suzana
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8482
AB  - Abstract: In the present paper, ionization energies of LinCln – 1 (n = 3, 4, and 5) clusters were studied by means of the modified Knudsen cell mass spectrometry method, for the first time. The temperature dependence of the intensities of Li3Cl2 +, Li4Cl3 + and Li5Cl4 + ions were measured in the interval 1128–1616, 1126–1435, and 1947–2278 K, respectively. The following ionization energies were obtained: IE(Li3Cl2) = 4.51 ± 0.2 eV, IE(Li4Cl3) = 4.18 ± 0.2 eV, and IE(Li4Cl3) = 5.05 ± 0.2 eV. A good correlation of the experimental results with the theoretical adiabatic ionization energy is recognized. Results are confirmation that these clusters can be classified as “superalkalis.”. © 2019, Pleiades Publishing, Ltd.
T2  - Russian Journal of Physical Chemistry A
T1  - Ionization Energies of LinCln – 1 (n = 3, 4, and 5) Clusters Studied by the Modified Knudsen Cell Mass Spectrometry Method
VL  - 93
IS  - 13
SP  - 2699
EP  - 2702
DO  - 10.1134/S0036024419130302
ER  - 

@article{
author = "Veljković, Filip M. and Vurdelja, Borislava D. and Rajčić, Boris and Veličković, Suzana",
year = "2019",
abstract = "Abstract: In the present paper, ionization energies of LinCln – 1 (n = 3, 4, and 5) clusters were studied by means of the modified Knudsen cell mass spectrometry method, for the first time. The temperature dependence of the intensities of Li3Cl2 +, Li4Cl3 + and Li5Cl4 + ions were measured in the interval 1128–1616, 1126–1435, and 1947–2278 K, respectively. The following ionization energies were obtained: IE(Li3Cl2) = 4.51 ± 0.2 eV, IE(Li4Cl3) = 4.18 ± 0.2 eV, and IE(Li4Cl3) = 5.05 ± 0.2 eV. A good correlation of the experimental results with the theoretical adiabatic ionization energy is recognized. Results are confirmation that these clusters can be classified as “superalkalis.”. © 2019, Pleiades Publishing, Ltd.",
journal = "Russian Journal of Physical Chemistry A",
title = "Ionization Energies of LinCln – 1 (n = 3, 4, and 5) Clusters Studied by the Modified Knudsen Cell Mass Spectrometry Method",
volume = "93",
number = "13",
pages = "2699-2702",
doi = "10.1134/S0036024419130302"
}

Veljković, F. M., Vurdelja, B. D., Rajčić, B.,& Veličković, S.. (2019). Ionization Energies of LinCln – 1 (n = 3, 4, and 5) Clusters Studied by the Modified Knudsen Cell Mass Spectrometry Method. in Russian Journal of Physical Chemistry A, 93(13), 2699-2702.
https://doi.org/10.1134/S0036024419130302

Veljković FM, Vurdelja BD, Rajčić B, Veličković S. Ionization Energies of LinCln – 1 (n = 3, 4, and 5) Clusters Studied by the Modified Knudsen Cell Mass Spectrometry Method. in Russian Journal of Physical Chemistry A. 2019;93(13):2699-2702.
doi:10.1134/S0036024419130302 .

Veljković, Filip M., Vurdelja, Borislava D., Rajčić, Boris, Veličković, Suzana, "Ionization Energies of LinCln – 1 (n = 3, 4, and 5) Clusters Studied by the Modified Knudsen Cell Mass Spectrometry Method" in Russian Journal of Physical Chemistry A, 93, no. 13 (2019):2699-2702,
https://doi.org/10.1134/S0036024419130302 . .

TY  - CONF
AU  - Veljković, Filip
AU  - Rajčić, Boris
AU  - Veličković, Suzana
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11395
AB  - Jedinjenja hlorata i perhlorata koja se koriste kao herbicidi, pogonska čvrsta goriva i eksplozivi, i sve češće se prepoznaju kao zagađivači podzemnih voda [1]. Perhlorati su posebno opasni jer ometaju proizvodnju hormona u štitnoj žlezdi. Hlor je podložan izotopskom frakcionisanju fizičkim i hemijskim procesima. Varijacije u atomskim masama, kao i u zastupljenosti izotopa hlora su posledica njegovog izotopskog frakcionisanja tokom fizičkih, hemijskih i bioloških procesa. Upravo, te varijacije su korisne za određivanje porekla supstance i proučavanje ekoloških, hidroloških i geoloških procesa. Takođe, analizom izotopa hlora može se utvrditi i priroda zagađivača životne sredine odnosno da li je njegovo poreklo antropogeno ili ne. Informacije mogu biti važne iz pravnih razloga i za remedijaciju kontaminiranog područja [2, 3]. Hlor se u prirodi javlja u obliku dva stabilna izotopa 35Cl i 37Cl (relativnih atomskih masa, respektivno 34,968 8527 i 36,965 9026), čiji relativni izotopski sastav je 0,7553 i 0,2547 [4]. Merenje odnosa stabilnih izotopa hlora (n(37Cl)/n(35Cl)), kao i molske frakcije 36Cl (n(36Cl)/n(Cl)) pruža korisne informacije o poreklu hlorata i perhlorata u okruženju [2, 3]. Ranija merenja promene odnosa stabilnih izotopa hlora rađena su pomoću magnetnog masenog spektrometra sa površinskom jonizacijom u negativnom modu direktnim praćenjem jona Cl-  [5], ili određivanjem promena izotopskog sastava praćenjem jona jedinjenja CH3 Cl+ [6]. Danas se metodom površinske jonizacije radi ispitivanja izotopskog sastava ne prate direktno joni hlora, već jedinjenja kao što su „superalkalni” klasteri tipa M2 Cl+  (M-alkalni metali). Razlog je, vrlo niska energija jonizacije pomenutih klastera (u nekim slučajevima niža od energije jonizacije cezijuma) što omogućava njihovu vrlo jednostavnu detekciju u masenom spektru [7]. Iako je ova metoda precizna i pouzdana, vrlo je skupa. Broj analiza izotopa hlora pomoću ugljovodonika koji u sastavu imaju hlor kao što je trihloretilen je u porastu, jer su ove vrste važni zagađivači životne sredine. Analiza kontinuiranog protoka trihloretilena molekula, bilo gasnom hromatografijom/izotopskom masenom spektrometrijom (GC/IRMS) ili sa masenom spektrometrijom GC/kvadrupol (GC/qMS), je inovativno analitičko rešenje, ali uprkos ranijim implementacijama, nedostaje joj rutinska aplikacija [8]. Pored navedenih tehnika u površinske metode jonizacije spada i masenospektrometrijska metoda laserske desorpcije i jonizacije (LDI). Preliminarni rezultati ukazuju da se „superalkalni“ klasteri tipa M2 Cl+ mogu detektovati navedenom metodom. S obzirom na jednostavnost korišćenja i njenu ekonomsku isplatljivost, analiza i ispitivanje promene izotopskog sastava pomoću LDI metode može predstavljati važan korak u analitici
PB  - Belgrade : Serbian Chemical Society
C3  - ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
T1  - Metode površinske jonizacije za merenje izotopskog sastava hlora
T1  - Methods of surface ionization for the measurement of chlorine’s isotopic composition
SP  - 157
EP  - 158
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11395
ER  - 

@conference{
author = "Veljković, Filip and Rajčić, Boris and Veličković, Suzana",
year = "2018",
abstract = "Jedinjenja hlorata i perhlorata koja se koriste kao herbicidi, pogonska čvrsta goriva i eksplozivi, i sve češće se prepoznaju kao zagađivači podzemnih voda [1]. Perhlorati su posebno opasni jer ometaju proizvodnju hormona u štitnoj žlezdi. Hlor je podložan izotopskom frakcionisanju fizičkim i hemijskim procesima. Varijacije u atomskim masama, kao i u zastupljenosti izotopa hlora su posledica njegovog izotopskog frakcionisanja tokom fizičkih, hemijskih i bioloških procesa. Upravo, te varijacije su korisne za određivanje porekla supstance i proučavanje ekoloških, hidroloških i geoloških procesa. Takođe, analizom izotopa hlora može se utvrditi i priroda zagađivača životne sredine odnosno da li je njegovo poreklo antropogeno ili ne. Informacije mogu biti važne iz pravnih razloga i za remedijaciju kontaminiranog područja [2, 3]. Hlor se u prirodi javlja u obliku dva stabilna izotopa 35Cl i 37Cl (relativnih atomskih masa, respektivno 34,968 8527 i 36,965 9026), čiji relativni izotopski sastav je 0,7553 i 0,2547 [4]. Merenje odnosa stabilnih izotopa hlora (n(37Cl)/n(35Cl)), kao i molske frakcije 36Cl (n(36Cl)/n(Cl)) pruža korisne informacije o poreklu hlorata i perhlorata u okruženju [2, 3]. Ranija merenja promene odnosa stabilnih izotopa hlora rađena su pomoću magnetnog masenog spektrometra sa površinskom jonizacijom u negativnom modu direktnim praćenjem jona Cl-  [5], ili određivanjem promena izotopskog sastava praćenjem jona jedinjenja CH3 Cl+ [6]. Danas se metodom površinske jonizacije radi ispitivanja izotopskog sastava ne prate direktno joni hlora, već jedinjenja kao što su „superalkalni” klasteri tipa M2 Cl+  (M-alkalni metali). Razlog je, vrlo niska energija jonizacije pomenutih klastera (u nekim slučajevima niža od energije jonizacije cezijuma) što omogućava njihovu vrlo jednostavnu detekciju u masenom spektru [7]. Iako je ova metoda precizna i pouzdana, vrlo je skupa. Broj analiza izotopa hlora pomoću ugljovodonika koji u sastavu imaju hlor kao što je trihloretilen je u porastu, jer su ove vrste važni zagađivači životne sredine. Analiza kontinuiranog protoka trihloretilena molekula, bilo gasnom hromatografijom/izotopskom masenom spektrometrijom (GC/IRMS) ili sa masenom spektrometrijom GC/kvadrupol (GC/qMS), je inovativno analitičko rešenje, ali uprkos ranijim implementacijama, nedostaje joj rutinska aplikacija [8]. Pored navedenih tehnika u površinske metode jonizacije spada i masenospektrometrijska metoda laserske desorpcije i jonizacije (LDI). Preliminarni rezultati ukazuju da se „superalkalni“ klasteri tipa M2 Cl+ mogu detektovati navedenom metodom. S obzirom na jednostavnost korišćenja i njenu ekonomsku isplatljivost, analiza i ispitivanje promene izotopskog sastava pomoću LDI metode može predstavljati važan korak u analitici",
publisher = "Belgrade : Serbian Chemical Society",
journal = "ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts",
title = "Metode površinske jonizacije za merenje izotopskog sastava hlora, Methods of surface ionization for the measurement of chlorine’s isotopic composition",
pages = "157-158",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11395"
}

Veljković, F., Rajčić, B.,& Veličković, S.. (2018). Metode površinske jonizacije za merenje izotopskog sastava hlora. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
Belgrade : Serbian Chemical Society., 157-158.
https://hdl.handle.net/21.15107/rcub_vinar_11395

Veljković F, Rajčić B, Veličković S. Metode površinske jonizacije za merenje izotopskog sastava hlora. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts. 2018;:157-158.
https://hdl.handle.net/21.15107/rcub_vinar_11395 .

Veljković, Filip, Rajčić, Boris, Veličković, Suzana, "Metode površinske jonizacije za merenje izotopskog sastava hlora" in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts (2018):157-158,
https://hdl.handle.net/21.15107/rcub_vinar_11395 .

TY  - JOUR
AU  - Rajčić, Boris
AU  - Dimitrijević, Silvana B.
AU  - Petković, Marijana
AU  - Nišavić, Marija
AU  - Cindrić, Mario
AU  - Veljković, Filip M.
AU  - Veličković, Suzana
PY  - 2018
UR  - http://link.springer.com/10.1007/s11082-018-1476-2
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7687
AB  - In this work, a simple way for study the possibility of formation a vapor cluster species of tetrachloroauric acid (HAuCl4), using the laser ablation in the absence of a buffer or reactive atmosphere, and without a postablation supersonic expansion on a commercial matrix assisted laser desorption/ionization time-of-flight mass spectrometer, is reported. Tetrachloroauric acid is known as precursor for the synthesis of gold nanostructures and the complex salts; therefore it is an important task to discover and quantify the species arising from HAuCl4, in order to understand their role in the gold assisted reactions. Mass spectrum of HAuCl4in a reflector negative-ion mode contains the hydrated mono- and dinuclear gold clusters in the m/z range 286–436, and gold chloride clusters in the m/z range 447–795. In the first part of spectrum, m/z range 286–436, the hydrated gold cluster species of type Aun−(H2O)m(n = 1–2; m = 1, 2, 5, 7, 8) and [Aun(OH)k]−(H2O)m(n = 1–2; k = 1–2; m = 1, 4–8) were found. Besides that, there are gold chloride clusters with general formula [AuHr(HCl)2]−(H2O)m(m = 1–5; 8–9; r = 0–2) in this part of spectrum. In the second part of spectrum, the m/z range 447–795, only gold chloride clusters were obtained. Their general formulae can be written as [AuClt(HCl)v]−(H2O)m(t = 1–4; v = 5–8; m = 2–4, 6–8) and [Aun(HCl)v]−(H2O)m(n = 1–2, v = 4–5, m = 1–2, 5, 7). The analysis of concentration effects on the LDI mass spectra of gold clusters reveals that the relative intensities of signals for the mono- and dinuclear Au clusters increase with decreasing the concentration of water HAuCl4solutions.
T2  - Optical and Quantum Electronics
T1  - Gold chloride cluster ions generated by vacuum laser ablation
VL  - 50
IS  - 5
SP  - 218
DO  - 10.1007/s11082-018-1476-2
ER  - 

@article{
author = "Rajčić, Boris and Dimitrijević, Silvana B. and Petković, Marijana and Nišavić, Marija and Cindrić, Mario and Veljković, Filip M. and Veličković, Suzana",
year = "2018",
abstract = "In this work, a simple way for study the possibility of formation a vapor cluster species of tetrachloroauric acid (HAuCl4), using the laser ablation in the absence of a buffer or reactive atmosphere, and without a postablation supersonic expansion on a commercial matrix assisted laser desorption/ionization time-of-flight mass spectrometer, is reported. Tetrachloroauric acid is known as precursor for the synthesis of gold nanostructures and the complex salts; therefore it is an important task to discover and quantify the species arising from HAuCl4, in order to understand their role in the gold assisted reactions. Mass spectrum of HAuCl4in a reflector negative-ion mode contains the hydrated mono- and dinuclear gold clusters in the m/z range 286–436, and gold chloride clusters in the m/z range 447–795. In the first part of spectrum, m/z range 286–436, the hydrated gold cluster species of type Aun−(H2O)m(n = 1–2; m = 1, 2, 5, 7, 8) and [Aun(OH)k]−(H2O)m(n = 1–2; k = 1–2; m = 1, 4–8) were found. Besides that, there are gold chloride clusters with general formula [AuHr(HCl)2]−(H2O)m(m = 1–5; 8–9; r = 0–2) in this part of spectrum. In the second part of spectrum, the m/z range 447–795, only gold chloride clusters were obtained. Their general formulae can be written as [AuClt(HCl)v]−(H2O)m(t = 1–4; v = 5–8; m = 2–4, 6–8) and [Aun(HCl)v]−(H2O)m(n = 1–2, v = 4–5, m = 1–2, 5, 7). The analysis of concentration effects on the LDI mass spectra of gold clusters reveals that the relative intensities of signals for the mono- and dinuclear Au clusters increase with decreasing the concentration of water HAuCl4solutions.",
journal = "Optical and Quantum Electronics",
title = "Gold chloride cluster ions generated by vacuum laser ablation",
volume = "50",
number = "5",
pages = "218",
doi = "10.1007/s11082-018-1476-2"
}

Rajčić, B., Dimitrijević, S. B., Petković, M., Nišavić, M., Cindrić, M., Veljković, F. M.,& Veličković, S.. (2018). Gold chloride cluster ions generated by vacuum laser ablation. in Optical and Quantum Electronics, 50(5), 218.
https://doi.org/10.1007/s11082-018-1476-2

Rajčić B, Dimitrijević SB, Petković M, Nišavić M, Cindrić M, Veljković FM, Veličković S. Gold chloride cluster ions generated by vacuum laser ablation. in Optical and Quantum Electronics. 2018;50(5):218.
doi:10.1007/s11082-018-1476-2 .

Rajčić, Boris, Dimitrijević, Silvana B., Petković, Marijana, Nišavić, Marija, Cindrić, Mario, Veljković, Filip M., Veličković, Suzana, "Gold chloride cluster ions generated by vacuum laser ablation" in Optical and Quantum Electronics, 50, no. 5 (2018):218,
https://doi.org/10.1007/s11082-018-1476-2 . .

TY  - JOUR
AU  - Rakić-Kostić, Tijana M.
AU  - Bogojeski, Jovana V.
AU  - Popović, Iva A.
AU  - Nešić, Maja D.
AU  - Rajčić, Boris
AU  - Nišavić, Marija
AU  - Petković, Marijana
AU  - Veličković, Suzana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1362
AB  - This paper presents optimization of matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometer (MS) instrumental parameters for the analysis of chloro(2,2 , 2 -terpyridine) palladium(II) chloride dihydrate complex applying design of experiments methodology (DoE). This complex is of interest for potential use in the cancer therapy. DoE methodology was proved to succeed in optimization of many complex analytical problems. However, it has been poorly used for MALDI-TOF-MS optimization up to now. The theoretical mathematical relationships which explain the influence of important experimental factors (laser energy, grid voltage and number of laser shots) on the selected responses (signal to noise - S/N ratio and the resolution - R of the leading peak) is established. The optimal instrumental settings providing maximal S/N and R are identified and experimentally verified.
T2  - Hemijska industrija
T1  - Experimental design for optimizing MALDI-TOF-MS analysis of palladium complexes
VL  - 71
IS  - 4
SP  - 281
EP  - 288
DO  - 10.2298/HEMIND160614038R
ER  - 

@article{
author = "Rakić-Kostić, Tijana M. and Bogojeski, Jovana V. and Popović, Iva A. and Nešić, Maja D. and Rajčić, Boris and Nišavić, Marija and Petković, Marijana and Veličković, Suzana",
year = "2017",
abstract = "This paper presents optimization of matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometer (MS) instrumental parameters for the analysis of chloro(2,2 , 2 -terpyridine) palladium(II) chloride dihydrate complex applying design of experiments methodology (DoE). This complex is of interest for potential use in the cancer therapy. DoE methodology was proved to succeed in optimization of many complex analytical problems. However, it has been poorly used for MALDI-TOF-MS optimization up to now. The theoretical mathematical relationships which explain the influence of important experimental factors (laser energy, grid voltage and number of laser shots) on the selected responses (signal to noise - S/N ratio and the resolution - R of the leading peak) is established. The optimal instrumental settings providing maximal S/N and R are identified and experimentally verified.",
journal = "Hemijska industrija",
title = "Experimental design for optimizing MALDI-TOF-MS analysis of palladium complexes",
volume = "71",
number = "4",
pages = "281-288",
doi = "10.2298/HEMIND160614038R"
}

Rakić-Kostić, T. M., Bogojeski, J. V., Popović, I. A., Nešić, M. D., Rajčić, B., Nišavić, M., Petković, M.,& Veličković, S.. (2017). Experimental design for optimizing MALDI-TOF-MS analysis of palladium complexes. in Hemijska industrija, 71(4), 281-288.
https://doi.org/10.2298/HEMIND160614038R

Rakić-Kostić TM, Bogojeski JV, Popović IA, Nešić MD, Rajčić B, Nišavić M, Petković M, Veličković S. Experimental design for optimizing MALDI-TOF-MS analysis of palladium complexes. in Hemijska industrija. 2017;71(4):281-288.
doi:10.2298/HEMIND160614038R .

Rakić-Kostić, Tijana M., Bogojeski, Jovana V., Popović, Iva A., Nešić, Maja D., Rajčić, Boris, Nišavić, Marija, Petković, Marijana, Veličković, Suzana, "Experimental design for optimizing MALDI-TOF-MS analysis of palladium complexes" in Hemijska industrija, 71, no. 4 (2017):281-288,
https://doi.org/10.2298/HEMIND160614038R . .

TY  - JOUR
AU  - Kamčeva, Tina T.
AU  - Nešić, Maja D.
AU  - Stoiljković, Milovan
AU  - Popović, Iva A.
AU  - Miletić, Jadranka
AU  - Rajčić, Boris
AU  - Petković, Marijana
AU  - Veličković, Suzana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1471
AB  - In this work it has been shown that both the laser desorption/ionization mass spectrometry (LDI MS) and the matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI TOF MS) are the simple and quick methods for determination of relative natural isotopic distribution of lead. The analysis of metal salts with these approaches does not require any time-consuming preparation of samples: a single run can take only a minute, and numerous information can be obtained. Results obtained in this work show that chosen matrix has no negative effect on quantitative determination of lead isotopes and support once more the applicability of MALDI TOF MS for lead isotope distribution determination in the sample and accurate data are obtained. Additionally, the generation of PbnOn and PbnOn-1 (n: 2-6) clusters have been successfully achieved in the positive mode, using the both LDI and MALDI methods. All stoichiometries were confirmed using isotopic pattern modelling.
T2  - Hemijska industrija
T1  - Determination of isotopic distribution of lead by a matrix assisted laser desorption/ionization versus a laser desorption/ionization time of flight mass spectrometry
VL  - 71
IS  - 1
SP  - 19
EP  - 26
DO  - 10.2298/HEMIND151218013K
ER  - 

@article{
author = "Kamčeva, Tina T. and Nešić, Maja D. and Stoiljković, Milovan and Popović, Iva A. and Miletić, Jadranka and Rajčić, Boris and Petković, Marijana and Veličković, Suzana",
year = "2017",
abstract = "In this work it has been shown that both the laser desorption/ionization mass spectrometry (LDI MS) and the matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI TOF MS) are the simple and quick methods for determination of relative natural isotopic distribution of lead. The analysis of metal salts with these approaches does not require any time-consuming preparation of samples: a single run can take only a minute, and numerous information can be obtained. Results obtained in this work show that chosen matrix has no negative effect on quantitative determination of lead isotopes and support once more the applicability of MALDI TOF MS for lead isotope distribution determination in the sample and accurate data are obtained. Additionally, the generation of PbnOn and PbnOn-1 (n: 2-6) clusters have been successfully achieved in the positive mode, using the both LDI and MALDI methods. All stoichiometries were confirmed using isotopic pattern modelling.",
journal = "Hemijska industrija",
title = "Determination of isotopic distribution of lead by a matrix assisted laser desorption/ionization versus a laser desorption/ionization time of flight mass spectrometry",
volume = "71",
number = "1",
pages = "19-26",
doi = "10.2298/HEMIND151218013K"
}

Kamčeva, T. T., Nešić, M. D., Stoiljković, M., Popović, I. A., Miletić, J., Rajčić, B., Petković, M.,& Veličković, S.. (2017). Determination of isotopic distribution of lead by a matrix assisted laser desorption/ionization versus a laser desorption/ionization time of flight mass spectrometry. in Hemijska industrija, 71(1), 19-26.
https://doi.org/10.2298/HEMIND151218013K

Kamčeva TT, Nešić MD, Stoiljković M, Popović IA, Miletić J, Rajčić B, Petković M, Veličković S. Determination of isotopic distribution of lead by a matrix assisted laser desorption/ionization versus a laser desorption/ionization time of flight mass spectrometry. in Hemijska industrija. 2017;71(1):19-26.
doi:10.2298/HEMIND151218013K .

Kamčeva, Tina T., Nešić, Maja D., Stoiljković, Milovan, Popović, Iva A., Miletić, Jadranka, Rajčić, Boris, Petković, Marijana, Veličković, Suzana, "Determination of isotopic distribution of lead by a matrix assisted laser desorption/ionization versus a laser desorption/ionization time of flight mass spectrometry" in Hemijska industrija, 71, no. 1 (2017):19-26,
https://doi.org/10.2298/HEMIND151218013K . .

TY  - CONF
AU  - Rajčić, Boris
AU  - Pantić, Tijana
AU  - Dimitrijević, S.B.
AU  - Dimitrijević, S.P.
AU  - Veljković, Filip M.
AU  - Petković, Marijana
AU  - Veličković, Suzana
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9171
AB  - Gold  chloride  clusters  were  generated  from  an  aqueous  solution  of gold-hydrochloric    acid    deposited    onto    the    target    plate using    laser desorption/ionization   (LDI)   on    a    commercial   matrix   assisted   laser desorption/ionization –time  of  flight  (MALDI-TOF)  mass  spectrometric instrument. In  our experimental  conditions  negative  mode  of  LDI  mass spectra  provided  the  most  valuable  informations. The  mass  peaks  at  m/z about  339,  499,  571,  641,  were  assigned  to AuCl4-,  Au2Cl3-,  Au2Cl5-, Au2Cl7-cluster  ions,  respectively.  The  Au2Cl5-and  Au2Cl7-clusters  are detected for the first time in this work. This research showed that LDI MS, thanks to its easy experimental procedure, a soft ionization technique which may be a useful characterization tool in the chemistry of heterogeneous gold clusters.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
T1  - Generation of Au2Cl2n+1 (n = 1-3) cluster ions by laser desorption/ionization mass spectrometry
SP  - 163
EP  - 166
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9171
ER  - 

@conference{
author = "Rajčić, Boris and Pantić, Tijana and Dimitrijević, S.B. and Dimitrijević, S.P. and Veljković, Filip M. and Petković, Marijana and Veličković, Suzana",
year = "2016",
abstract = "Gold  chloride  clusters  were  generated  from  an  aqueous  solution  of gold-hydrochloric    acid    deposited    onto    the    target    plate using    laser desorption/ionization   (LDI)   on    a    commercial   matrix   assisted   laser desorption/ionization –time  of  flight  (MALDI-TOF)  mass  spectrometric instrument. In  our experimental  conditions  negative  mode  of  LDI  mass spectra  provided  the  most  valuable  informations. The  mass  peaks  at  m/z about  339,  499,  571,  641,  were  assigned  to AuCl4-,  Au2Cl3-,  Au2Cl5-, Au2Cl7-cluster  ions,  respectively.  The  Au2Cl5-and  Au2Cl7-clusters  are detected for the first time in this work. This research showed that LDI MS, thanks to its easy experimental procedure, a soft ionization technique which may be a useful characterization tool in the chemistry of heterogeneous gold clusters.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry",
title = "Generation of Au2Cl2n+1 (n = 1-3) cluster ions by laser desorption/ionization mass spectrometry",
pages = "163-166",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9171"
}

Rajčić, B., Pantić, T., Dimitrijević, S.B., Dimitrijević, S.P., Veljković, F. M., Petković, M.,& Veličković, S.. (2016). Generation of Au2Cl2n+1 (n = 1-3) cluster ions by laser desorption/ionization mass spectrometry. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., 163-166.
https://hdl.handle.net/21.15107/rcub_vinar_9171

Rajčić B, Pantić T, Dimitrijević S, Dimitrijević S, Veljković FM, Petković M, Veličković S. Generation of Au2Cl2n+1 (n = 1-3) cluster ions by laser desorption/ionization mass spectrometry. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry. 2016;:163-166.
https://hdl.handle.net/21.15107/rcub_vinar_9171 .

Rajčić, Boris, Pantić, Tijana, Dimitrijević, S.B., Dimitrijević, S.P., Veljković, Filip M., Petković, Marijana, Veličković, Suzana, "Generation of Au2Cl2n+1 (n = 1-3) cluster ions by laser desorption/ionization mass spectrometry" in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry (2016):163-166,
https://hdl.handle.net/21.15107/rcub_vinar_9171 .