Visible and VUV images of dielectric barrier discharges in Xe

R. P. Mildren*, R. J. Carman, I. S. Falconer

*Corresponding author for this work

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We have recorded short exposure images of visible and vacuum ultraviolet (VUV) emission from a Xe dielectric barrier discharge lamp, and investigated the effects of excitation by fast rising pulse and sinusoidal voltage waveforms on the discharge structure. The images from the pulsed discharge are essentially uniform over the active electrode area unlike the sinusoidal discharge which is filamentary. By investigating a single filament discharge, it is also found that a large fraction (>90%) of the total visible and VUV emission for sinusoidal excitation is generated from regions outside the filament. The images suggest that the VUV is generated from surface discharges, or 'feelers', which branch out laterally from the filaments. Model calculations suggest that surface or volume discharges, in which the current density is much lower than for filamentary discharges, generate VUV emission more efficiently due to the reduced rate for multi-step electron excitation of Xe* species.

Original languageEnglish
Pages (from-to)3378-3382
Number of pages5
JournalJournal of Physics D: Applied Physics
Volume34
Issue number23
DOIs
Publication statusPublished - 7 Dec 2001

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