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Using the relative kinetic method rate coefficients have been determined for the gas-phase reaction of bromine (Br) radicals with a series of alkenes, chloroalkenes, dienes. and aromatic hydrocarbons in 1000 mbar of synthetic air at 298 ? 2 K. Both the UV photolysis of CH,Br, ( A = 254 n m ) and the visible photolysis of Br, (320 5 A 5 480) were used to generate Br radicals. For the alkenes and dienes the following rate coefficients were obtained ( i n units of cm3 molecule-' s -l ) : trans-2-butene 9.

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