✦ LIBER ✦

Kinetics of the reaction HO2 + NO2(+M) = HO2NO2 using molecular modulation spectrometry

✍ Scribed by R. A. Cox; K. Patrick

Publisher: John Wiley and Sons
Year: 1979
Tongue: English
Weight: 718 KB
Volume: 11
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550110610

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✦ Synopsis

Rate constants for the reaction H02 + NO,(+ M) = HO*N02(+ M) have been obtained from direct observations of the HOz radical using the technique of molecular modulation ultraviolet spectrometry. HOz was generated by periodic photolysis of Clz in the presence of excess Hz and 0 2 , and k l was determined from the measured concentrations and lifetime of HO2 with NO2 present. k l increased with pressure in the range of 40-600 Torr, and a simple energy transfer model gave the following limiting second-and third-order rate constants a t 283 K: k;" = 1.5 f 0.5 X cm6/moleesec. The ultraviolet absorption spectrum of peroxynitric acid was also recorded in the range of 195-265 nm; it showed a broad feature with a maximum at 200 nm, umax = 4.4 X cm2.

cm3/moleesec and k'," = 2.5 f 0.5 X

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