Rates of elementary reactions involving the BrO(X2Π) and IO (X2Π) radicals. Part 1.—Formation and decay of the BrO radical

Ground state BrO (X2Π,v″= 0) radicals, produced by reaction (1), Br(2P)+O3→BrO+O2(1) were detected using time-resolved electronic absorption spectrophotometry in a discharge-flow system. Removal of BrO redicals occurs through a rapid bimolecular disproportionation reaction producing bromine atoms(2), [graphic ommitted]. The value of k2(cm3 mol –1 s–1) at 293 K was (6.3±0.9)× 1012, and its temperature dependence from 293 to 573 K was given by k2= 10(13.5±0.2) exp [(–450±300)/T]. Reaction (2) shows an anomalously large steric factor.