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Rate constants for the reaction of hydroxyl radicals with methyl bromide have been measured by the discharge flow—resonance fluorescence(DF—RF)technique over the temperature range 288—351K．The derived Arrbenius equation is：k”=(3．42±0．12)×10-12 exp(-(1419±158)/T)cm3/(mol·s)．The tropospheric lifetime of methyl bromide was estimated to be 1．60 years．An ODP value of 0．33 for methyl bromide was obtained．
