Rate coefficients for the reaction of iodine oxide with methyl peroxy radicals

  • Dillon T
  • Tucceri M
  • Crowley J
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Abstract Pulsed laser photolysis radical generation is used to study the title reaction IO+CH3O2→products. Sensitive and selective laser-induced fluorescence detection of IO allows excess CH3O2 conditions to be maintained throughout, ensuring minimal interference from other fast IO reactions. The rate coefficients, k5(296 K)=(3.4±1.4)×10−12 cm3 molecule−1 s−1, are obtained relative to a well-characterised reference value (k3 for IO+HO2). This result agrees well with a previous determination from this laboratory and demonstrates that the above reaction proceeds an order of magnitude slower than suggested in other recent experimental and theoretical studies. Implications for HOx production/O3 destruction within the marine boundary layer are briefly discussed.

Author-supplied keywords

  • atmospheric chemistry
  • iodine
  • kinetics
  • pulsed laser photolysis
  • radical reactions

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  • Terry J. Dillon

  • María E. Tucceri

  • John N. Crowley

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