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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

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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

Stark-shifted Ar I 517.753 nm line in the cathode sheath of the Grimm-type GDS, and the unshifted line emitted from the zero-field region

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Data Availability Statement

The data sets supporting the conclusions of this article are available from the corresponding author upon reasonable request.

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Acknowledgements

This work is supported by the Ministry of Education, Science, and Technological Development of the Republic of Serbia (Grant No. 451-03-68/2022-14/200162).

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Authors and Affiliations

  1. Faculty of Physics, University of Belgrade, P.O. Box 44, 11001, Belgrade, Serbia

    Nikodin V. Nedić, Ivan R. Videnović & Djordje Spasojević

  2. Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080, Belgrade, Serbia

    Nikola V. Ivanović

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  1. Nikodin V. Nedić
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  2. Nikola V. Ivanović
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  3. Ivan R. Videnović
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  4. Djordje Spasojević
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Contributions

NVN contributed to conceptualization, investigation, methodology, and writing—original draft. NVI contributed to conceptualization, investigation, methodology, and writing—original draft. IRV contributed to conceptualization, methodology, and writing—review and editing. DS contributed to conceptualization, methodology, writing—review and editing, and supervision.

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Correspondence to Nikola V. Ivanović.

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Nedić, N.V., Ivanović, N.V., Videnović, I.R. et al. 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. Eur. Phys. J. D 77, 5 (2023). https://doi.org/10.1140/epjd/s10053-022-00587-0

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