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)^2.9exp(-3000/RT) and for CH₃Br + Cl^•k = 1.5×10^-12(T/298)^2.0exp(-2900/RT), with k in cm³ molecule^-1 s^-1, T in K, and R = 1.987 cal mol^-1 K^-1.

甲基溴（CH ₃ Br）是一种有害的臭氧消耗物质，会从自然和人为来源释放到大气中。在对流层中，CH ₃ Br通过与^• OH和Cl ^•自由基反应而除去。在这里，将量子力学和统计力学计算与现有实验数据结合起来，以得到改进的速率系数表达式，以说明甲基溴与^• OH和Cl ^•在200至2000 K之间的反应。对于CH ₃ Br + ^• OH k = 9.8 ×10 ^-14（T / 298）^2.9曝光（-3000 / RT），对于CH ₃ Br + Cl ^• k = 1.5×10 ^-12（T / 298）^2.0 exp（-2900 / RT），其中k in cm ³分子为^-1 s ^-1，T in K为，R = 1.987 cal mol ^-1 K ^-1。