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Proceedings Paper

Production of metastable singlet oxygen in the reaction of nitric oxide with active oxygen
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Paper Abstract

Predictive modeling of the performance of EOIL laser systems must address the kinetics of the active oxygen flow, including the production of O3 from recombination of O and O2, and the effects of NO as an additive to remove O and promote O2(a) formation. This paper describes experimental measurements of the reaction kinetics for active-oxygen flows generated by microwave discharge of O2/He mixtures at 3 to 10 torr. The concentrations of O2(a1Δ), O, and O3 were directly measured as functions of reaction time in a discharge-flow reactor. Both the O removal rate and the O3 production rate were observed to be significantly lower than expected from the widely accepted three-body recombination mechanism for O3 production, indicating the existence of a previously unknown O3 dissociation reaction. Addition of NO to the flow well downstream of the discharge resulted in readily detectable production of O2(a) in addition to that generated by the discharge. The observed O2(a) production rates were remarkably insensitive to variations in total pressure, O2 concentration, and NO concentration over the ranges investigated. The mechanism for this O2(a) production remains to be identified, however it appears to involve a hitherto undetected, metastable, energetic species produced in the active-oxygen flow.

Paper Details

Date Published: 21 February 2008
PDF: 11 pages
Proc. SPIE 6874, High Energy/Average Power Lasers and Intense Beam Applications II, 68740B (21 February 2008); doi: 10.1117/12.773783
Show Author Affiliations
Wilson T. Rawlins, Physical Sciences Inc. (United States)
Seonkyung Lee, Physical Sciences Inc. (United States)
Steven J. Davis, Physical Sciences Inc. (United States)

Published in SPIE Proceedings Vol. 6874:
High Energy/Average Power Lasers and Intense Beam Applications II
Steven J. Davis; Michael C. Heaven; J. Thomas Schriempf, Editor(s)

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