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Kinetic study of the reactions of Br 2 with OH and OD
Author(s) -
Bedjanian Y.,
Le Bras G.,
Poulet G.
Publication year - 1999
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1999)31:10<698::aid-jck3>3.0.co;2-o
Subject(s) - chemistry , kinetics , arrhenius equation , bromine , branching (polymer chemistry) , torr , kinetic energy , atmospheric temperature range , chemical kinetics , analytical chemistry (journal) , medicinal chemistry , activation energy , organic chemistry , thermodynamics , physics , quantum mechanics
The kinetics of the reactions OH + Br 2 → HOBr + Br (1) and OD + Br 2 → DOBr + Br (3) have been studied in the temperature range 230–360 K and at total pressure of 1 Torr of helium using the discharge‐flow mass spectrometric method. The following Arrhenius expressions were obtained either from the kinetics of product formation (HOBr, DOBr) in excess of Br 2 over OH and OD or from the kinetics of Br 2 consumption in excess of OH and OD: k 1 = (1.8 ± 0.3) × 10 −11 exp [(235 ± 50)/T] and k 3 = (1.9 ± 0.2) × 10 −11 exp [(220 ± 25)/T] cm 3 molecule −1 s −1 . For the reaction channels of the title reactions: OH + Br 2 → BrO + HBr and OD + Br 2 → BrO + DBr, the upper limits of the branching ratios were found to be 0.03 and 0.02 at T = 320 K, respectively. © 1999 John Wiley & Sons, Inc. Int J Chem Kinet 31: 698–704, 1999