Dynamics of oh (X^n, v- 0) in high-energy atmospheric pressure electrical pulsed discharge

Document Type

Article

Publication Date

1-14-1995

Abstract

Time transients of the number density of the hydroxyl radical ground state X2n(v = 0) formed in the DC high-energy atmospheric pressure pulsed discharge were measured by means of laser-induced fluorescence. The frequency doubled dye laser was tuned to the A2S X2n (v' = 1 < - v" = 0) transition at 282 nm while emission at 309 nm from A2St-> X2n (v1 = 0-v" = 0) band, was observed. The discharge peak current lm3X varied from 10"2 to 10 A, and the time duration was from 500 ns to 50 ¡is. The discharge was operated at repetition rate of 10 Hz. The population of v" = 0 of OH reaches the steady state within the first 20 ¡is of the discharge and its value is independent on the current for /max > 0,2 A. The significant build-up of v" = 0 state population was observed after the discharge pulse. The hydroxyl ground state number density reaches its maximum value approximately 100 ¡is after the discharge and is up to three times larger than during the discharge pulse. This increase of v" = 0 population is attributed to the vibrational relaxation within X2n state. © 1995 IOP Publishing Ltd.

Publication Title

Journal of Physics D: Applied Physics

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