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The effect of methanol on the self reaction of HO 2 radicals
Author(s) -
Andersson B. Y.,
Cox R. A.,
Jenkin M. E.
Publication year - 1988
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550200403
Subject(s) - chemistry , radical , methanol , reaction rate constant , atmospheric pressure , analytical chemistry (journal) , nitrogen , atmospheric temperature range , kinetics , thermodynamics , organic chemistry , meteorology , quantum mechanics , physics
The rate constant for the HO 2 self reaction has been determined as a function of methanol vapor concentration at 278 K and 299 K. A molecular modulation technique was used in which HO 2 radicals were photochemically produced in flowing gas mixtures comprised of Cl 2 , CH 3 OH, N 2 and O 2 with HO 2 monitored in the UV at 220 nm. A positive linear dependence of the second order rate constant on methanol concentration was found and this effect increased with decreasing temperature. The rate constant for the HO 2 self reaction can be described by\documentclass{article}\pagestyle{empty}\begin{document}$$k = 9.2 \cdot 10^{- 15} {\rm \,exp(1700/}T)\,+ \,2.1 \cdot 10^{- 34} {\rm \,exp(3000/}T)[{\rm CH}_{\rm 3} {\rm OH]cm}^{\rm 3}\, {\rm \,molecule}^{{\rm - 1}} {\rm \,s}^{{\rm - 1}}$$\end{document} in nitrogen at atmospheric pressure and in the methanol concentration range 1 · 10 16 to 3 · 10 17 molecules cm −3 .