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Proceedings Paper

Tunable diode laser absorption spectroscopy for plasmas at elevated pressures
Author(s): H. Lange; R. Bussiahn
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Paper Abstract

A tuneable diode laser with external cavity in Littrow-configuration was used to probe the 2P6— is5 transition (823,163 nm) and the 2p5 — 1s4 transition (828,012 nm) of xenon in plasmas at elevated pressure, produced by a dielectric barrier discharge and a miniaturized hollow cathode discharge. These discharges where investigated in pure xenon atmosphere and partly in xenon-helium mixtures. After the description of the method a number of examples illustrating the use of diode lasers in plasma diagnostics by means of the absorption technique is presented. From these absorption measurements the optical depth of that above named xenon transitions correlating to the particle number density of the resonant and metastable level were calculated. By observing the afterglow phase in pulsed driven discharges, decay rates can be determined which are specific for various elementary processes. Comparing the obtained decay rates with those from literature fixes the correlated processes. Results of the time behavior of the optical depth show that the late time afterglow is governed by three body collision with neutral xenon atoms. From the spectrally-resolved absorption line-shapes particle number densities of the metastable level and their temperature were determined in a small sized hollow cathode discharge.

Paper Details

Date Published: 19 March 2002
PDF: 11 pages
Proc. SPIE 4460, Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures, (19 March 2002); doi: 10.1117/12.459396
Show Author Affiliations
H. Lange, Institut fuer Niedertemperatur-Plasmaphysik (Germany)
R. Bussiahn, Institut fuer Niedertemperatur-Plasmaphysik (Germany)

Published in SPIE Proceedings Vol. 4460:
Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures
Vladimir N. Ochkin, Editor(s)

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