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The fate of the hydroxyalkoxy radical in the OH-initiated oxidation of isoprene

✍ Scribed by June E. Reitz; W. Sean McGivern; M. Clark Church; Marc D. Wilson; Simon W. North

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
144 KB
Volume
34
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

Rate constants for several intermediate steps in the OH‐initiated oxidation of isoprene were determined using laser‐photolysis/laser‐induced fluorescence of OH radicals at total pressures between 3 and 4 Torr at 295 K. The rate constant for decomposition of the hydroxyalkoxy radical was determined to be (3.0 ± 0.5) × 10^4^ s^−1^ in this pressure range, which is in fair agreement with previous work. The presence of a prompt alkoxy decomposition pathway was also investigated and found to contribute less than 10% to the total hydroxyalkoxy radical decomposition. The rate constant for the reaction of the hydroxyperoxy radical with NO was determined to be (2.5 ± 0.5) × 10^−11^ cm^3^ molecule^−1^ s^−1^, which is moderately higher than previously reported. © 2002 Wiley Periodicals, Inc. Int J Chem Kinet 34: 255–261, 2002

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