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Proceedings Paper

Burning voltage of self-sustained volume discharge in CO2 laser irradiated SF6 and mixtures of SF6 with C2H6
Author(s): A. A. Belevtsev; K. N. Firsov; S. Yu. Kazantsev; I. G. Kononov
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Paper Abstract

The burning voltages of a self-sustained volume discharge (SSVD) in SF6 and SF6-C2H6 mixtures subjected to a 10.6 μm pulse CO2 laser irradiation are measured on varying the laser fluences and delays between the laser and voltage applications over a wide range. These voltages are found to considerably increase as the specific absorbed laser radiation energy increases. The observed effect is treated in terms of enhanced electron attachment due to the capturing of electrons by vibrationally excited molecules of SF6. Also given are the results of measuring the burning voltages in a non-irradiated confined SSVD in the same mixtures versus the specific electric energy deposited. Most plausible scenarios of vibrational relaxation in SF6 are qualitatively discussed and, on this basis, some inferences about the peculiarities of electron attachment to vibrationally excited molecules of SF6 are drawn. At lowest values of the specific absorbed laser radiation energy, realized in the present experiments, no significant impact on the discharge voltage was observed. Together with data on the burning voltages in a non-irradiated SSVD this fact has allowed some conclusions about the role of electron attachment to the discharge-produced vibrationally excited molecules of SF6. In particular the results obtained appear to give no evidence for the electron impact vibrational excitation of SF6 is capable of considerably affecting the operating characteristics of current electric discharge non-chain chemical HF lasers using SF6 and SF6-based mixtures.

Paper Details

Date Published: 9 June 2006
PDF: 9 pages
Proc. SPIE 6053, International Conference on Lasers, Applications, and Technologies 2005: High-Power Lasers and Applications, 60530E (9 June 2006); doi: 10.1117/12.660067
Show Author Affiliations
A. A. Belevtsev, Institute for High Energy Densities (Russia)
Associated Institute for High Temperatures (Russia)
K. N. Firsov, A.M. Prokhorov General Physics Institute (Russia)
S. Yu. Kazantsev, A.M. Prokhorov General Physics Institute (Russia)
I. G. Kononov, A.M. Prokhorov General Physics Institute (Russia)


Published in SPIE Proceedings Vol. 6053:
International Conference on Lasers, Applications, and Technologies 2005: High-Power Lasers and Applications
Willy L. Bohn; Vladimir S. Golubev; Andrey A. Ionin; Vladislav Ya. Panchenko, Editor(s)

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