TY  - JOUR
AU  - Šiljegović, Milorad
AU  - Kačarević-Popović, Zorica M.
AU  - Stchakovsky, M.
AU  - Radosavljević, Aleksandra
AU  - Korica, Sanja
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5943
AB  - The optical properties of 150 keV N+ implanted ethylene-norbornene (TOPAS 6017S-04) copolymer were investigated using phase modulated spectroscopic ellipsometry (PMSE) and ultraviolet-visible (UV-Vis) spectroscopy in the ranges of 0.6-6.5 eV and of 1.5-6.2 eV, respectively. The single-effectiveoscillator model was used to fit the calculated data to the experimental ellipsometric spectra. The results show that the oscillator and dispersion energies decrease with increasing ion fluence up to 10(15) cm(-2), and then these parameters increase with further fluence increasing. Analysis of the UV-Vis absorption spectra revealed the presence of indirect electronic transitions with the band gap energy in the range of 1.3 to 2.8 eV. It was found that both the band gap energy and the energy width of the distribution of localized band tail states decrease, while the values of Tauc coefficient increase with increasing the ion fluence. From the ellipsometric data we found that the real part of the dielectric function increased about 7% after irradiation with 10(15) cm(-2), and decreased about 10% in samples modified with 10(16) cm(-2).
T2  - Radiation Physics and Chemistry
T1  - Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films
VL  - 98
SP  - 7
EP  - 13
DO  - 10.1016/j.radphyschem.2013.12.023
ER  - 

@article{
author = "Šiljegović, Milorad and Kačarević-Popović, Zorica M. and Stchakovsky, M. and Radosavljević, Aleksandra and Korica, Sanja and Novaković, Mirjana M. and Popović, Maja",
year = "2014",
abstract = "The optical properties of 150 keV N+ implanted ethylene-norbornene (TOPAS 6017S-04) copolymer were investigated using phase modulated spectroscopic ellipsometry (PMSE) and ultraviolet-visible (UV-Vis) spectroscopy in the ranges of 0.6-6.5 eV and of 1.5-6.2 eV, respectively. The single-effectiveoscillator model was used to fit the calculated data to the experimental ellipsometric spectra. The results show that the oscillator and dispersion energies decrease with increasing ion fluence up to 10(15) cm(-2), and then these parameters increase with further fluence increasing. Analysis of the UV-Vis absorption spectra revealed the presence of indirect electronic transitions with the band gap energy in the range of 1.3 to 2.8 eV. It was found that both the band gap energy and the energy width of the distribution of localized band tail states decrease, while the values of Tauc coefficient increase with increasing the ion fluence. From the ellipsometric data we found that the real part of the dielectric function increased about 7% after irradiation with 10(15) cm(-2), and decreased about 10% in samples modified with 10(16) cm(-2).",
journal = "Radiation Physics and Chemistry",
title = "Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films",
volume = "98",
pages = "7-13",
doi = "10.1016/j.radphyschem.2013.12.023"
}

Šiljegović, M., Kačarević-Popović, Z. M., Stchakovsky, M., Radosavljević, A., Korica, S., Novaković, M. M.,& Popović, M.. (2014). Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films. in Radiation Physics and Chemistry, 98, 7-13.
https://doi.org/10.1016/j.radphyschem.2013.12.023

Šiljegović M, Kačarević-Popović ZM, Stchakovsky M, Radosavljević A, Korica S, Novaković MM, Popović M. Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films. in Radiation Physics and Chemistry. 2014;98:7-13.
doi:10.1016/j.radphyschem.2013.12.023 .

Šiljegović, Milorad, Kačarević-Popović, Zorica M., Stchakovsky, M., Radosavljević, Aleksandra, Korica, Sanja, Novaković, Mirjana M., Popović, Maja, "Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films" in Radiation Physics and Chemistry, 98 (2014):7-13,
https://doi.org/10.1016/j.radphyschem.2013.12.023 . .

TY  - JOUR
AU  - Petrović, Srđan M.
AU  - Korica, Sanja
AU  - Kokkoris, Michael
AU  - Nešković, Nebojša B.
PY  - 2002
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6334
AB  - In this study we analyze the angular distributions of Ne10+ ions channeled in the LT 100 GT Si crystals. The ion energy is 60 MeV and the crystal thickness is varied from 286 to 3435 nm. This thickness range corresponds to the reduced crystal thickness range from 0.5 to 6, i.e. from the second to the twelfth rainbow cycle. The angular distributions were obtained via the numerical solution of the ion equations of motion and the computer simulation method. The analysis shows that the angular distribution has a periodic behavior. We also analyze the transmission patterns corresponding to the angular distributions. These patterns should be compared to the experimental patterns obtainable by a two-dimensional position sensitive detector. We demonstrate that, when the ion beam divergence is sufficiently large, i.e. much larger than the critical angle for channeling, the channeling star effect occurs in the transmission patterns.
T2  - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1  - Angular distributions of ions channeled in the 〈1 0 0〉 Si crystals
VL  - 193
SP  - 152
EP  - 159
DO  - 10.1016/S0168-583X(02)00742-5
ER  - 

@article{
author = "Petrović, Srđan M. and Korica, Sanja and Kokkoris, Michael and Nešković, Nebojša B.",
year = "2002",
abstract = "In this study we analyze the angular distributions of Ne10+ ions channeled in the LT 100 GT Si crystals. The ion energy is 60 MeV and the crystal thickness is varied from 286 to 3435 nm. This thickness range corresponds to the reduced crystal thickness range from 0.5 to 6, i.e. from the second to the twelfth rainbow cycle. The angular distributions were obtained via the numerical solution of the ion equations of motion and the computer simulation method. The analysis shows that the angular distribution has a periodic behavior. We also analyze the transmission patterns corresponding to the angular distributions. These patterns should be compared to the experimental patterns obtainable by a two-dimensional position sensitive detector. We demonstrate that, when the ion beam divergence is sufficiently large, i.e. much larger than the critical angle for channeling, the channeling star effect occurs in the transmission patterns.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Angular distributions of ions channeled in the 〈1 0 0〉 Si crystals",
volume = "193",
pages = "152-159",
doi = "10.1016/S0168-583X(02)00742-5"
}

Petrović, S. M., Korica, S., Kokkoris, M.,& Nešković, N. B.. (2002). Angular distributions of ions channeled in the 〈1 0 0〉 Si crystals. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 193, 152-159.
https://doi.org/10.1016/S0168-583X(02)00742-5

Petrović SM, Korica S, Kokkoris M, Nešković NB. Angular distributions of ions channeled in the 〈1 0 0〉 Si crystals. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2002;193:152-159.
doi:10.1016/S0168-583X(02)00742-5 .

Petrović, Srđan M., Korica, Sanja, Kokkoris, Michael, Nešković, Nebojša B., "Angular distributions of ions channeled in the 〈1 0 0〉 Si crystals" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 193 (2002):152-159,
https://doi.org/10.1016/S0168-583X(02)00742-5 . .