Kinetics of VUV-VIS spontaneous emission of high-current pulsed volume discharge in argon

Alexander A. Lissovski; Alexey B. Treshchalov

doi:10.1117/12.677401

31 May 2006 Kinetics of VUV-VIS spontaneous emission of high-current pulsed volume discharge in argon

Alexander A. Lissovski, Alexey B. Treshchalov

Proceedings Volume 6263, Atomic and Molecular Pulsed Lasers VI; 62630H (2006) https://doi.org/10.1117/12.677401
Event: Atomic and Molecular Pulsed Lasers VI, 2005, Tomsk, Russian Federation

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^* ¹Σ_u⁺ (0) molecules increases during small-power secondary pumping pulses due to better mixing of singlet ¹Σ_u⁺ and triplet ³Σ_u⁺ Ar₂^* states by additional electrons.

Citation Download Citation

Alexander A. Lissovski and Alexey B. Treshchalov "Kinetics of VUV-VIS spontaneous emission of high-current pulsed volume discharge in argon", Proc. SPIE 6263, Atomic and Molecular Pulsed Lasers VI, 62630H (31 May 2006); https://doi.org/10.1117/12.677401

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