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Atmospheric chemistry of CH2BR2: Rate coefficients for its reaction with Cl atoms and OH and the chemistry of the CHBr2O radical

✍ Scribed by John J. Orlando; Geoffrey S. Tyndall; Timothy J. Wallington; Marchoe Dill

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 668 KB
Volume: 28
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1996)28:6<433::aid-kin5>3.0.co;2-w

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✦ Synopsis

Rate coefficients for the reaction of OH radicals and CI atoms with dibromomethane, OH + CH,Br2 -CHBr, + H,O ( I ) and CI + CH,Br, 4 CHBr, + HCI (31, and for the reaction of CI atoms with methyl bromide, C1 + CH,Br + HCI + CH,Br ( 4 ) , have been obtained using relative rate techniques. At 298 K, the value of k , was determined to be (1.2 ? 0 3 ) X crn' molec-I s I. T h e rate coefficients k, and k, were determined at a series of temperatures ranging from 228 K t o 296 K and combined with the measurements of Gierczak et al., yielding the following Arrhenius expressions for f , and k 4 ; f , = ( 6 3 5 ? 0 6 ) X lo-', exp(-807 t 50/T) cm? molec-' s-' and k, = ( 1 49 ? 0.2) X lo-" exp(-1056 5 50/T) cm' molec-' s '

In addition, the CI atom initiated oxidation mechanism of CH,Br, in air has been studied at 208 K The products observed were HC(0)Br and small amounts of CO. The dominant atmospheric fate of the alkoxy radical, CHBr,O, is elimination of a Br atom, which occurs at a rate estimated t o be greater than 4 X 10's-I in 700 torr of 0, at 298 K . 0 1996 lohn h'iley & Sons, Inc

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