|
Abstract: Production of metastable singlet oxygen in the reaction of nitric oxide with active oxygen
Wilson T. Rawlins, Seonkyung Lee, Steven J. Davis,
"Production of metastable singlet oxygen in the reaction of nitric oxide with active oxygen
,"
presented at SPIE Photonics West
(San Jose, CA)
,
(19-24 January2008).
Copyright © 2008 Society of Photo-Optical Instrumentation Engineers.
This paper was published in SPIE Photonics West,
and is made available as an electronic reprint (preprint)
with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple
reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this
paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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(a1࢞), 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.
sr-1318
|
