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Kinetic measurements of the gas phase HO2+CH3O2 cross-disproportionation reaction at 298 K

โœ Scribed by Michael J. Kurylo; Philippe Dagaut; Timothy J. Wallington; Douglas M. Neuman

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
476 KB
Volume
139
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

Plash photolysis kinetic absorption spectroscopy was used to investigate the gas phase reaction between hydroperoxy (HO,) and methylperoxy (CH302) radicals at 298 K. Due to the large difference between the self-reactivities of the two radicals, firstor second-order kinetic conditions could not be maintained for either species. Thus, the rate constant for the cross reaction was determined from computer-modeled tits of the radical absorption decay curves, at wavelengths between 215 and 280 nm. This procedure yielded k= 2.9 x 1 O-l* cm3 molecule-' s-' independent of total pressure (using Nz) between 25 and 600 Torr, and of the partial pressure of water vapor (up to 11.6 Torr). There was also no effect of water vapor on the rate constant for the selfreaction of methylperoxy radicals.

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