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The rate of reaction of methyl radicals with ozone

✍ Scribed by E. A. Ogryzlo; R. Paltenghi; Kyle D. Bayes

Publisher: John Wiley and Sons
Year: 1981
Tongue: English
Weight: 388 KB
Volume: 13
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550130707

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✦ Synopsis

Abstract

The absolute rate constant for the reaction of methyl radicals with ozone has been measured as a function of temperature. Small concentrations of CH~3~ were generated by flash photolyzing CH~3~NO~2~ at 193 nm with an ArF laser. A photoionization mass spectrometer was used to follow the rate of decay of CH~3~ at various ozone concentrations. The resulting rate constants could be fit by the expressions

over the temperature range of 243–384 K. These rate constants can be modeled by simple transition state theory using reasonable parameters for the activated complex. Use of this rate constant shows that less than 1% of the methyl radicals formed in the stratosphere react with ozone.

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