Kinetics of the reactions of alkyl radicals (CH sub 3 , C sub 2 H sub 5 , i-C sub 3 H sub 7 , and t-C sub 4 H sub 9 ) with molecular bromine

The gas-phase kinetics of the reactions of four alkyl radicals (CH{sub 3}, C{sub 2}H{sub 5}, i-C{sub 3}H{sub 7}, and t-C{sub 4}H{sub 9}) with molecular bromine have been studied over the temperature range 296-532 K. The reactions were isolated for quantitative study in a heatable tubular rector coupled to a photoionization mass spectrometer. Radicals were homogeneously generated in the reactor by pulsed photolysis of suitable precursor molecules at 193 or 248 nm. The subsequent decays of the radical concentration in the presence of different Br{sub 2} concentrations were monitored in time-resolved experiments. Rate constants were obtained at five temperatures.