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Rate Coefficients for the Reaction of Iodine Oxide with Methyl Peroxy Radicals
Author(s) -
Dillon Terry J.,
Tucceri María E.,
Crowley John N.
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000466
Subject(s) - radical , chemistry , photodissociation , photochemistry , iodine , reaction rate constant , laser , analytical chemistry (journal) , molecule , kinetics , organic chemistry , physics , optics , quantum mechanics
Pulsed laser photolysis radical generation is used to study the title reaction IO+CH 3 O 2 →products. Sensitive and selective laser‐induced fluorescence detection of IO allows excess CH 3 O 2 conditions to be maintained throughout, ensuring minimal interference from other fast IO reactions. The rate coefficients, k 5 (296 K)=(3.4±1.4)×10 −12 cm 3 molecule −1 s −1 , are obtained relative to a well‐characterised reference value ( k 3 for IO+HO 2 ). 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 HO x production/O 3 destruction within the marine boundary layer are briefly discussed.