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Abstract
The kinetics and products of reaction 1 between gas-phase BrO and IO radicals have been studied using the technique of laser photolysis with time-resolved UV−vis absorption spectroscopy. The O + IBr reaction 8, used as one source of IO and BrO radicals, was found to produce predominantly IO radicals at 295 K. The rate coefficient for reaction 8 is correlated with the branching ratio for IO production (channel 8a). Using a value of 0.7 for the branching ratio for IO production (k8a/k8), k8 was found to be (3.6 ± 2.4) × 10-11 cm3 molecule-1 s-1 at 295 K, with no significant temperature dependence between 210 and 333 K. Sensitivity tests using a kinetic model showed that, in addition to (1), decay traces were also sensitive to the rate coefficient for reaction 12: I + BrO → Br + IO. This rate coefficient was found to be (1.3 ± 1.2) × 10-11 molecule-1 cm3 s-1 at 295 K, with no significant temperature dependence between 235 and 333 K. The title reaction (1), IO + BrO → products was found to have a rate coeffi...
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