Abstract
Methyl bromide (CH3Br) is a hazardous ozone depleting substance that is released to the atmosphere from natural and anthropogenic sources. Within the troposphere CH3Br is removed through reaction with OH and Cl radicals. Here, quantum and statistical mechanical calculations are combined with existing experimental data in order to arrive at improved rate coefficient expressions for the reaction of methyl bromide with OH and Cl from 200 to 2000 K. For CH3Br + OH k = 9.8 × 10−14 (T/298)2.9 exp(−3000/RT) and for CH3Br + Clk = 1.5 × 10−12 (T/298)2.0 exp(−2900/RT), with k in cm3 molecule−1 s−1, T in K, and R = 1.987 cal mol−1 K−1.
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