Rate coefficients for the reaction of iodine oxide with methyl peroxy radicals.
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 HOx production/O(3) destruction within the marine boundary layer are briefly discussed.
Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, 55020 Mainz, Germany. terry.dillon@mpic.de
Terry J
TJ
Dillon
María E
ME
Tucceri
John N
JN
Crowley
D007455:Iodine / Q000737:chemistry; D007700:Kinetics; D007834:Lasers; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry; D010782:Photolysis; D017382:Reactive Oxygen Species / Q000737:chemistry; D013696:Temperature
D010087:Oxides; D017382:Reactive Oxygen Species; D007455:Iodine