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Kinetics of the CH3O2 + HO2 reaction: A temperature and pressure dependence study using chemical ionization mass spectrometry

✍ Scribed by M. Teresa Raventós-Duran; Max McGillen; Carl J. Percival; Paul D. Hamer; Dudley E. Shallcross

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
186 KB
Volume
39
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

A temperature and pressure kinetic study for the CH~3~O~2~ + HO~2~ reaction has been performed using the turbulent flow technique with a chemical ionization mass spectrometry detection system. An Arrhenius expression was obtained for the overall rate coefficient of CH~3~O~2~ + HO~2~ reaction: k(T) = (3.82^+2.79^~−1.61~) × 10^−13^ exp[(−781 ± 127)/T] cm^−3^ molecule^−1^ s^−1^. A direct quantification of the branching ratios for the O~3~ and OH product channels, at pressures between 75 and 200 Torr and temperatures between 298 and 205 K, was also investigated. The atmospheric implications of considering the upper limit rate coefficients for the O~3~ and OH branching channels are observed with a significant reduction of the concentration of CH~3~OOH, which leads to a lower amount of methyl peroxy radical. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 39: 571–579, 2007

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