The BrO transient formed during the pulse radiolysis of <tex-math>${\rm O}_{2}+{\rm Br}_{2}$</tex-math> mixtures decayed according to second-order kinetics, and the rate constant decreased slightly as O2 pressure was increased from 400 to 1560 Torr. Besides the variation with pressure, the BrO recombination reaction exhibited an initial phase in the time regime 3-50 μsec under certain experimental conditions during which BrO disappearance occurred at a faster rate. In the pulse radiolysis of <tex-math>${\rm N}_{2}{\rm O}+{\rm Br}_{2}$</tex-math> mixtures, the kinetics of BrO disappearance were found to be sensitive to the dose. In the lower dose range used in this work, the second-order rate plots were linear and BrO decay was invariant with pressure. With mixtures irradiated to a higher dose, BrO decay was also rapid but did not follow simple kinetics. The molar extinction coefficient of BrO was measured at three wavelengths in the near-uv region by determining the amount of <tex-math>${\rm Br}_{2}$</tex-math> that temporarily disappears during radiolysis. The molar extinction coefficient (<tex-math>$M^{-1}\times {\rm cm}^{-1}$</tex-math>) was found to be 1,620 at 338 nm, 1,500 at 333 nm, and 1,530 at 321 nm.

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