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Direct kinetics study of the temperature dependence of the CH2O branching channel for the CH3O2 + HO2 reaction

✍ Scribed by Matthew J. Elrod; Dana L. Ranschaert; Nicholas J. Schneider

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
274 KB
Volume
33
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

A direct kinetics study of the temperature dependence of the CH~2~O branching channel for the CH~3~O~2~ + HO~2~ reaction has been performed using the turbulent flow technique with high‐pressure chemical ionization mass spectrometry for the detection of reactants and products. The temperature dependence of the CH~2~O‐producing channel rate constant was investigated between 298 and 218 K at a pressure of 100 Torr, and the data were fitted to the following Arrhenius expression: 1.6 × 10^−15^ × exp[(1730 ± 130)/T] cm^3^ molecule^−1^ s^−1^. Using the Arrhenius expression for the overall rate of the CH~3~O~2~ + HO~2~ reaction and this result, the 298 K branching ratio for the CH~2~O producing channel is measured to be 0.11, and the branching ratio is calculated to increase to a value of 0.31 at 218 K, the lowest temperature accessed in this study. The results are compared to the analogous CH~3~O~2~ + CH~3~O~2~ reaction and the potential atmospheric ramifications of significant CH~2~O production from the CH~3~O~2~ + HO~2~ reaction are discussed. © 2001 John Wiley & Sons, Inc. Int J Chem Kinet 33: 363–376, 2001

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