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Kinetics of VUV-VIS spontaneous emission of high-current pulsed volume discharge in argon
Author(s): Alexander A. Lissovski; Alexey B. Treshchalov
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Paper Abstract

Spatial-time behavior of the main excited atomic and molecular excimer species were monitored with ns-gated ICCD camera (200-850 nm) and solar-blind PMT (115-300 nm) from spontaneous emission spectra of homogeneous volume discharge in high-pressure (up to 10 bar) argon. It is revealed, that broad (200-700 nm) UV-VIS continuum is caused mainly by radiative recombination of free plasma electrons with Ar2+ ions. Emission intensities from this continuum and red Ar* lines have a typical recombination behavior in the afterglow stage of the discharge (square root of its intensity is proportional to the electron density). Observed UV-VIS continuum spectrum is modeling by free-bound photorecombination transitions to manifold of 4s, 4s, 4p, 4p, 3d, 3d Ar* levels. Peak intensity of the second continuum VUV emission from Ar2* excimers (126 nm) increases approximately quadratically with the gas pressure. This behavior is observed at pressure range of 1-2 bar, however at higher pressures the peak intensity has a tendency to the saturation. VUV emission from Ar2* 1Σu+ (0) molecules increases during small-power secondary pumping pulses due to better mixing of singlet 1Σu+ and triplet 3Σu+ Ar2* states by additional electrons.

Paper Details

Date Published: 31 May 2006
PDF: 10 pages
Proc. SPIE 6263, Atomic and Molecular Pulsed Lasers VI, 62630H (31 May 2006); doi: 10.1117/12.677401
Show Author Affiliations
Alexander A. Lissovski, Tartu Ülikool (Estonia)
Alexey B. Treshchalov, Tartu Ülikool (Estonia)

Published in SPIE Proceedings Vol. 6263:
Atomic and Molecular Pulsed Lasers VI
Victor F. Tarasenko; Georgy Mayer; Gueorgii G. Petrash, Editor(s)

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