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Kinetic and mechanistic study of the reactions of OH with IBr and HOI

Abstract : The kinetics and mechanism of the reactions of OH radicals with IBr and HOI have been studied using the mass spectrometric discharge-flow method at 320 K and at a total pressure of 1 Torr of Helium. The rate constant of the reaction OH + IBr → products (1) was measured under pseudo-first order conditions either in excess of IBr or in excess of OH radicals: k1 = (1.4 ± 0.4) × 10−10 cm3 molecule−1 s−1. Both HOI and HOBr were detected as products of reaction (1) and the branching ratios 0.84 ± 0.07 and 0.14 ± 0.05, respectively, were found for the channels forming these species. For the reaction OH + HOI → products (2) the total rate constant was determined from the kinetics of HOI consumption in excess of OH radicals: k2 = (5.0 ± 1.2) × 10−12 cm3 molecule−1 s−1.
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Submitted on : Thursday, May 7, 2020 - 3:48:35 PM
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Véronique Riffault, Yuri Bedjanian, Gilles Poulet. Kinetic and mechanistic study of the reactions of OH with IBr and HOI. Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2005, 176 (1-3), pp.155-161. ⟨10.1016/j.jphotochem.2005.09.002⟩. ⟨hal-02567027⟩

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