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The kinetics of the nitrate radical self-reaction

✍ Scribed by P. Biggs; C. E. Canosa-Mas; P. S. Monks; R. P. Wayne; Th. Benter; R. N. Schindler

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
701 KB
Volume
25
Category
Article
ISSN
0538-8066

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✦ Synopsis

Ahtract

This article describes the first direct determination of the rate coefficient for the self-reaction between two NO3 radicals. A laser photolysis technique was used to generate NO3, and timeresolved decays of NO3 were followed after stopping the photolysis. The products of the reaction are inferred to be NO2 and 0 2 . The derived rate coefficient at room temperature for the selfreaction of (2.3 * 0.8) X cm3 molecule-' s-l is in excellent agreement with the only other data, which were obtained in an indirect study. Consideration is given to the magnitude and influence of secondary chemistry and to the participation of FO in the chemistry of the NO3 buildup phase. The studies were conducted over a pressure range of 8 to 100 torr in helium. No clear pressure dependence was observed, and some tentative inferences are drawn both from this result and from the absolute magnitude of the rate Coefficient about the mechanism of the reaction. There is apparently no role for the reaction in the chemistry of the atmosphere.

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