Abstract
The kinetics of the reactions of Br atoms with HO2 and DO2 radicals, Br + HO2 → HBr + O2 (1), and Br + DO2 → DBr + O2 (3), have been studied by the mass spectrometric discharge-flow method at temperatures between 230 and 355 K and at a total pressure of 1 Torr of helium. The rate coefficients measured under pseudo-first-order conditions in excess Br yield the following Arrhenius expressions: k1 = (4.9 ± 0.7) × 10-12 exp[−(310 ± 40)/T] and k3 = (1.9 ± 0.4) × 10-12 exp[−(540 ± 60)/T] cm3 molecule-1 s-1 (uncertainties are 2σ). The k3 value is measured for the first time and that of k1 is compared with those from previous studies.
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