TY  - JOUR
AU  - Nedić, Nikodin V.
AU  - Ivanović, Nikola V.
AU  - Videnović, Ivan R.
AU  - Spasojević, Djordje
PY  - 2023
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6258
AB  - We present the results of the optical emission spectroscopy study of the Ar I 517.753 nm spectral line, observed at different positions in the cathode sheath of an abnormal DC Grimm-type glow discharge source operated in argon. The line profiles were recorded parallel to the cathode surface (side-on view), along the discharge axis from the cathode towards the negative glow. The spectra show a red line shift, which diminishes with the distance from the cathode surface and decreasing electric field. This allows experimental determination of the coefficient C in quadratic relation, Δν = CE2, between the wavenumber Stark shifts, Δν, and electric field strength, E. The above relation is a low-field (up to 25 kV/cm) approximation of the quadratic dependence of the upper-level shift, measured for a large set of argon lines at high electric fields (up to 700 kV/cm) by Windholz (Phys Scr 21:67–74, 1980). One of these lines, Ar I 537.349 nm, is used here for independent measurement of the electric field E and correlated with the Ar I 517.753 nm upper-level wavenumber shift Δν to obtain a line-specific coefficient C. In this way, the Ar I 517.753 nm spectral line complements the set of argon lines suitable for Stark spectroscopy diagnostics of the electric field distribution and cathode sheath length, the knowledge of which allows for a better understanding and description of the glow discharge processes through various theoretical models. Graphical abstract: [Figure not available: see fulltext.]. © 2022, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.
T2  - European Physical Journal D
T2  - European Physical Journal D
T1  - On the use of Ar I 517.753 nm spectral line for electric field measurements in the cathode sheath of a Grimm-type glow discharge source
IS  - 1
VL  - 77
DO  - 10.1140/epjd/s10053-022-00587-0
ER  - 

@article{
author = "Nedić, Nikodin V. and Ivanović, Nikola V. and Videnović, Ivan R. and Spasojević, Djordje",
year = "2023",
abstract = "We present the results of the optical emission spectroscopy study of the Ar I 517.753 nm spectral line, observed at different positions in the cathode sheath of an abnormal DC Grimm-type glow discharge source operated in argon. The line profiles were recorded parallel to the cathode surface (side-on view), along the discharge axis from the cathode towards the negative glow. The spectra show a red line shift, which diminishes with the distance from the cathode surface and decreasing electric field. This allows experimental determination of the coefficient C in quadratic relation, Δν = CE2, between the wavenumber Stark shifts, Δν, and electric field strength, E. The above relation is a low-field (up to 25 kV/cm) approximation of the quadratic dependence of the upper-level shift, measured for a large set of argon lines at high electric fields (up to 700 kV/cm) by Windholz (Phys Scr 21:67–74, 1980). One of these lines, Ar I 537.349 nm, is used here for independent measurement of the electric field E and correlated with the Ar I 517.753 nm upper-level wavenumber shift Δν to obtain a line-specific coefficient C. In this way, the Ar I 517.753 nm spectral line complements the set of argon lines suitable for Stark spectroscopy diagnostics of the electric field distribution and cathode sheath length, the knowledge of which allows for a better understanding and description of the glow discharge processes through various theoretical models. Graphical abstract: [Figure not available: see fulltext.]. © 2022, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.",
journal = "European Physical Journal D, European Physical Journal D",
title = "On the use of Ar I 517.753 nm spectral line for electric field measurements in the cathode sheath of a Grimm-type glow discharge source",
number = "1",
volume = "77",
doi = "10.1140/epjd/s10053-022-00587-0"
}

Nedić, N. V., Ivanović, N. V., Videnović, I. R.,& Spasojević, D.. (2023). On the use of Ar I 517.753 nm spectral line for electric field measurements in the cathode sheath of a Grimm-type glow discharge source. in European Physical Journal D, 77(1).
https://doi.org/10.1140/epjd/s10053-022-00587-0

Nedić NV, Ivanović NV, Videnović IR, Spasojević D. On the use of Ar I 517.753 nm spectral line for electric field measurements in the cathode sheath of a Grimm-type glow discharge source. in European Physical Journal D. 2023;77(1).
doi:10.1140/epjd/s10053-022-00587-0 .

Nedić, Nikodin V., Ivanović, Nikola V., Videnović, Ivan R., Spasojević, Djordje, "On the use of Ar I 517.753 nm spectral line for electric field measurements in the cathode sheath of a Grimm-type glow discharge source" in European Physical Journal D, 77, no. 1 (2023),
https://doi.org/10.1140/epjd/s10053-022-00587-0 . .

TY  - JOUR
AU  - Spasojević, Djordje
AU  - Ivanović, Nikola V.
AU  - Nedić, Nikodin V.
AU  - Vasiljević, Milica
AU  - Šišović, Nikola M.
AU  - Konjević, Nikola
PY  - 2023
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6350
AB  - We report a study of the cathode sheath (CS) space of the argon glow discharges in the abnormal DC regime by means of the iterative kinetic model. By matching the model shapes of the side-on spectra with the experimental data for the Ar II 460.954 nm line obtained via optical emission spectroscopy, we have estimated the thickness of the CS space and the distributions of the electric field strength and gas temperature over the entire CS space of discharge. Graphical abstract: [Figure not available: see fulltext.] © 2023, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.
T2  - European Physical Journal D
T2  - European Physical Journal D
T1  - Iterative kinetic model application in diagnostics of argon abnormal DC glow discharges
IS  - 5
VL  - 77
DO  - 10.1140/epjd/s10053-023-00650-4
ER  - 

@article{
author = "Spasojević, Djordje and Ivanović, Nikola V. and Nedić, Nikodin V. and Vasiljević, Milica and Šišović, Nikola M. and Konjević, Nikola",
year = "2023",
abstract = "We report a study of the cathode sheath (CS) space of the argon glow discharges in the abnormal DC regime by means of the iterative kinetic model. By matching the model shapes of the side-on spectra with the experimental data for the Ar II 460.954 nm line obtained via optical emission spectroscopy, we have estimated the thickness of the CS space and the distributions of the electric field strength and gas temperature over the entire CS space of discharge. Graphical abstract: [Figure not available: see fulltext.] © 2023, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.",
journal = "European Physical Journal D, European Physical Journal D",
title = "Iterative kinetic model application in diagnostics of argon abnormal DC glow discharges",
number = "5",
volume = "77",
doi = "10.1140/epjd/s10053-023-00650-4"
}

Spasojević, D., Ivanović, N. V., Nedić, N. V., Vasiljević, M., Šišović, N. M.,& Konjević, N.. (2023). Iterative kinetic model application in diagnostics of argon abnormal DC glow discharges. in European Physical Journal D, 77(5).
https://doi.org/10.1140/epjd/s10053-023-00650-4

Spasojević D, Ivanović NV, Nedić NV, Vasiljević M, Šišović NM, Konjević N. Iterative kinetic model application in diagnostics of argon abnormal DC glow discharges. in European Physical Journal D. 2023;77(5).
doi:10.1140/epjd/s10053-023-00650-4 .

Spasojević, Djordje, Ivanović, Nikola V., Nedić, Nikodin V., Vasiljević, Milica, Šišović, Nikola M., Konjević, Nikola, "Iterative kinetic model application in diagnostics of argon abnormal DC glow discharges" in European Physical Journal D, 77, no. 5 (2023),
https://doi.org/10.1140/epjd/s10053-023-00650-4 . .

TY  - JOUR
AU  - Nedić, Nikodin V.
AU  - Ivanović, Nikola V.
AU  - Videnović, Ivan R.
AU  - Spasojević, Djordje
AU  - Konjević, Nikola
PY  - 2022
UR  - https://pubs.rsc.org/en/content/articlelanding/2022/ja/d2ja00109h
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6141
AB  - We present a series of optical emission spectroscopy (OES) measurements of the stable correlation in characteristic features of spectral line shapes of neutral neon and argon, recorded in the Grimm-type plane cathode DC glow discharge (GD) source from two positions: (1) perpendicular to the cathode surface from the end of the discharge, in line with the discharge axis (end-on view) and (2) side-on cathode view, parallel to the cathode surface and perpendicular to the discharge axis, at the position of the maximum external electric field Fmax in the cathode sheath (CS), close to the cathode surface. Side-on view recording enables spatially resolved OES in the CS, where the Stark effect decisively determines the splitting and shifting of line components relative to the unshifted zero-field line. On the other hand, commonly available end-on view spectra recording in standard analytical Grimm-type sources collects integral light emission from the different layers of the discharge, both CS and negative glow (NG). However, distinct Stark components of several Ne I and Ar I lines' splitting and shifting in the CS are preserved as characteristic excessive wings broadening features in the end-on recordings as well. Following spectral measurements of six Ne I and four Ar I lines in a broad range of discharge conditions (pressure, voltage, current) and cathode materials, we report on a sustained correlation coefficient of 1.083 in neon and 1.129 in argon between the side-on recorded components shift Δλs at the position of maximum field Fmax in the CS, and the end-on recorded wings broadening characteristic features shift Δλe. Individual Ne I and Ar I lines' correlation coefficients Δλs/Δλe are reported also. These coefficients can be used to estimate the maximum CS electric field Fmax and the CS thickness dc within reasonable margins of uncertainty in a standard analytical Grimm-type GD source with an end-on view available only.
T2  - Journal of Analytical Atomic Spectrometry
T2  - Journal of Analytical Atomic SpectrometryJ. Anal. At. Spectrom.
T1  - Estimation of the maximum electric field strength in the cathode sheath of a Grimm-type glow discharge by end-on view optical emission spectroscopy in neon and argon
EP  - 1326
IS  - 6
SP  - 1318
VL  - 37
DO  - 10.1039/D2JA00109H
ER  - 

@article{
author = "Nedić, Nikodin V. and Ivanović, Nikola V. and Videnović, Ivan R. and Spasojević, Djordje and Konjević, Nikola",
year = "2022",
abstract = "We present a series of optical emission spectroscopy (OES) measurements of the stable correlation in characteristic features of spectral line shapes of neutral neon and argon, recorded in the Grimm-type plane cathode DC glow discharge (GD) source from two positions: (1) perpendicular to the cathode surface from the end of the discharge, in line with the discharge axis (end-on view) and (2) side-on cathode view, parallel to the cathode surface and perpendicular to the discharge axis, at the position of the maximum external electric field Fmax in the cathode sheath (CS), close to the cathode surface. Side-on view recording enables spatially resolved OES in the CS, where the Stark effect decisively determines the splitting and shifting of line components relative to the unshifted zero-field line. On the other hand, commonly available end-on view spectra recording in standard analytical Grimm-type sources collects integral light emission from the different layers of the discharge, both CS and negative glow (NG). However, distinct Stark components of several Ne I and Ar I lines' splitting and shifting in the CS are preserved as characteristic excessive wings broadening features in the end-on recordings as well. Following spectral measurements of six Ne I and four Ar I lines in a broad range of discharge conditions (pressure, voltage, current) and cathode materials, we report on a sustained correlation coefficient of 1.083 in neon and 1.129 in argon between the side-on recorded components shift Δλs at the position of maximum field Fmax in the CS, and the end-on recorded wings broadening characteristic features shift Δλe. Individual Ne I and Ar I lines' correlation coefficients Δλs/Δλe are reported also. These coefficients can be used to estimate the maximum CS electric field Fmax and the CS thickness dc within reasonable margins of uncertainty in a standard analytical Grimm-type GD source with an end-on view available only.",
journal = "Journal of Analytical Atomic Spectrometry, Journal of Analytical Atomic SpectrometryJ. Anal. At. Spectrom.",
title = "Estimation of the maximum electric field strength in the cathode sheath of a Grimm-type glow discharge by end-on view optical emission spectroscopy in neon and argon",
pages = "1326-1318",
number = "6",
volume = "37",
doi = "10.1039/D2JA00109H"
}

Nedić, N. V., Ivanović, N. V., Videnović, I. R., Spasojević, D.,& Konjević, N.. (2022). Estimation of the maximum electric field strength in the cathode sheath of a Grimm-type glow discharge by end-on view optical emission spectroscopy in neon and argon. in Journal of Analytical Atomic Spectrometry, 37(6), 1318-1326.
https://doi.org/10.1039/D2JA00109H

Nedić NV, Ivanović NV, Videnović IR, Spasojević D, Konjević N. Estimation of the maximum electric field strength in the cathode sheath of a Grimm-type glow discharge by end-on view optical emission spectroscopy in neon and argon. in Journal of Analytical Atomic Spectrometry. 2022;37(6):1318-1326.
doi:10.1039/D2JA00109H .

Nedić, Nikodin V., Ivanović, Nikola V., Videnović, Ivan R., Spasojević, Djordje, Konjević, Nikola, "Estimation of the maximum electric field strength in the cathode sheath of a Grimm-type glow discharge by end-on view optical emission spectroscopy in neon and argon" in Journal of Analytical Atomic Spectrometry, 37, no. 6 (2022):1318-1326,
https://doi.org/10.1039/D2JA00109H . .

TY  - JOUR
AU  - Spasojević, Djordje
AU  - Ivanović, Nikola V.
AU  - Nedić, Nikodin V.
AU  - Rajačić, Luka
AU  - Šišović, Nikola M.
AU  - Konjević, Nikola
PY  - 2021
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5989
AB  - We report results of an experimental and theoretical study of complex UV line shapes of Ne II 369.421 nm, Ne II 370.962 nm, Ne II 371.308 nm, and. Ne II 372.711 nm lines in the cathode sheath (CS) region of an abnormal DC glow discharge in pure neon. Two sets of experimental profiles and electric field distributions, one for discharge with tungsten and the other with titanium cathode, were obtained by means of the optical emission spectroscopy (OES) and theoretically studied by the iterative CS kinetic model. It is shown that our theoretical model enables the determination of the most important CS parameters (e.g. the thickness of the CS region, and the theoretical distributions of electric field and gas temperature) and thereupon based accurate theoretical predictions of the experimentally observed profiles of the studied lines.
PB  - Elsevier Ltd
T2  - Advances in Space Research
T1  - Study of UV Ne II line shapes in the cathode sheath of an abnormal glow discharge
DO  - 10.1016/j.asr.2021.11.014
ER  - 

@article{
author = "Spasojević, Djordje and Ivanović, Nikola V. and Nedić, Nikodin V. and Rajačić, Luka and Šišović, Nikola M. and Konjević, Nikola",
year = "2021",
abstract = "We report results of an experimental and theoretical study of complex UV line shapes of Ne II 369.421 nm, Ne II 370.962 nm, Ne II 371.308 nm, and. Ne II 372.711 nm lines in the cathode sheath (CS) region of an abnormal DC glow discharge in pure neon. Two sets of experimental profiles and electric field distributions, one for discharge with tungsten and the other with titanium cathode, were obtained by means of the optical emission spectroscopy (OES) and theoretically studied by the iterative CS kinetic model. It is shown that our theoretical model enables the determination of the most important CS parameters (e.g. the thickness of the CS region, and the theoretical distributions of electric field and gas temperature) and thereupon based accurate theoretical predictions of the experimentally observed profiles of the studied lines.",
publisher = "Elsevier Ltd",
journal = "Advances in Space Research",
title = "Study of UV Ne II line shapes in the cathode sheath of an abnormal glow discharge",
doi = "10.1016/j.asr.2021.11.014"
}

Spasojević, D., Ivanović, N. V., Nedić, N. V., Rajačić, L., Šišović, N. M.,& Konjević, N.. (2021). Study of UV Ne II line shapes in the cathode sheath of an abnormal glow discharge. in Advances in Space Research
Elsevier Ltd..
https://doi.org/10.1016/j.asr.2021.11.014

Spasojević D, Ivanović NV, Nedić NV, Rajačić L, Šišović NM, Konjević N. Study of UV Ne II line shapes in the cathode sheath of an abnormal glow discharge. in Advances in Space Research. 2021;.
doi:10.1016/j.asr.2021.11.014 .

Spasojević, Djordje, Ivanović, Nikola V., Nedić, Nikodin V., Rajačić, Luka, Šišović, Nikola M., Konjević, Nikola, "Study of UV Ne II line shapes in the cathode sheath of an abnormal glow discharge" in Advances in Space Research (2021),
https://doi.org/10.1016/j.asr.2021.11.014 . .