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Proceedings Paper

Features of the formation of barrier discharge in xenon excimer lamps
Author(s): Galina N. Zvereva; Elizaveta Yu. Letova
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Paper Abstract

The features of the formation of a barrier discharge in xenon (p = 300 Torr) depending on the frequency of the pulses of the applied voltage were studied in this work. It was found that the discharge in the frequency range f = 1–40 kHz has three modes: 1) visually homogeneous low-power mode at f = 1–4 kHz, 2) channel mode at f≈5 kHz, and uniform powerful one at f> 5 kHz. Dependences of current and voltage on time indicate that at f ≤5 kHz the discharge is initiated due to streamer and at f> 5 kHz due to the Townsend breakdown mechanisms. The transition from a low-power to a channel mode can be explained by thermal constriction: the gas temperature gradient and spatial heterogeneity of the electron production increase with frequency growth, aggravated by the death of electrons during dissociative recombination. The transition from a channel mode to a homogeneous powerful one can be explained by an increase in stepwise ionization, which reduces the spatial inhomogeneity of electron production. In argon and krypton discharges of a similar design in the frequency range f = 1–40 kHz, only a uniform powerful mode, initiated by the Townsend breakdown mechanism, was observed. This can be explained by lower values of the dissociative recombination rates in Ar and Kr in comparison with Xe and larger values of electron diffusion coefficients. In the VUV emission spectrum of the Xe discharge a band was observed with a maximum at λ= 173 nm. The intensity of the band linearly increased from 1 to 30 mW/cm2 in the range f = 1–40 kHz. In the UV region a low intensity continuum with a maximum at λ = 270 nm was observed. In the visible region, Xe atomic lines were recorded in the area λ = 440-500 nm, which appear as a result of dissociative recombination of the Xe2+ ion.

Paper Details

Date Published: 11 December 2019
PDF: 8 pages
Proc. SPIE 11322, XIV International Conference on Pulsed Lasers and Laser Applications, 1132222 (11 December 2019); doi: 10.1117/12.2548856
Show Author Affiliations
Galina N. Zvereva, State Univ. of Civil Aviation (Russian Federation)
S. I. Vavilov State Optical Institute (Russian Federation)
Elizaveta Yu. Letova, ITMO Univ. (Russian Federation)

Published in SPIE Proceedings Vol. 11322:
XIV International Conference on Pulsed Lasers and Laser Applications
Victor F. Tarasenko; Anton V. Klimkin; Maxim V. Trigub, Editor(s)

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