Dynamic photolytical actinometry of the vacuum-ultraviolet radiation produced by multichannel surface discharges of submicrosecond duration
- Laboratoire Lasers, Plasmas et Procedes Photoniques (LP3), UMR 6182 CNRS-Universite Aix-Marseille II, Campus de Luminy, Case 917, 13288, Marseille, Cedex 9 (France)
Absolute measurements of the vacuum-ultraviolet (VUV) radiation power produced by a planar broadband optical source of submicrosecond light pulse duration are carried out in the transient regime of formation of a photodissociation (bleaching) wave in a photodecomposing absorptive medium. The source is based on a multichannel surface discharge initiated in Ar/N{sub 2} gas mixtures on the area of {approx}0.1 m{sup 2}. The energetic characteristics of the produced VUV radiation are determined on the basis of spatially and temporally resolved observations of the pulsed photolysis of XeF{sub 2} vapors. It is shown that the photon flux intensity produced by the source within the spectral range of 120-200 nm reaches 1.1x10{sup 23} photons/cm{sup 2} s corresponding to the effective brightness temperature of discharge plasma of 20 kK and to the intrinsic efficiency of the discharge VUV emission of 3.2%. Numerical simulations of the photolysis process show a rather weak sensitivity of the results to the fraction of discharge radiation emitted into the line spectrum, as well as to the angular distribution of emitted radiation. The spectral band of measurements can be selected according to the choice of parent photodecomposing particles.
- OSTI ID:
- 20953462
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 6 Vol. 78; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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