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

Wilson T. Rawlins; Seonkyung Lee; Steven J. Davis

doi:10.1117/12.773783

21 February 2008 Production of metastable singlet oxygen in the reaction of nitric oxide with active oxygen

Wilson T. Rawlins, Seonkyung Lee, Steven J. Davis

Author Affiliations +

Proceedings Volume 6874, High Energy/Average Power Lasers and Intense Beam Applications II; 68740B (2008) https://doi.org/10.1117/12.773783
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

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.

Citation Download Citation

Wilson T. Rawlins, Seonkyung Lee, and Steven J. Davis "Production of metastable singlet oxygen in the reaction of nitric oxide with active oxygen", Proc. SPIE 6874, High Energy/Average Power Lasers and Intense Beam Applications II, 68740B (21 February 2008); https://doi.org/10.1117/12.773783

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