A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H₂O + Br

Abstract

Abstract The temperature dependence of the rate coefficient for the reaction, OH + HBr has been reinvestigated at low temperatures ( T = 48–224 K) by using uniform supersonic flow reactors with laser induced fluorescence detection. This paper presents two forms of global fits: k ( T ) = 1.11 × 10 −11 ( T /298) −0.91 cm 3 s −1 and k ( T ) = 1.06 × 10 −11 ( T /298) −1.09 $\exp({-10.5 K\over T})$ cm 3 s −1 , both of which accurately describe the temperature dependence of the rate coefficient for the title reaction within the temperature range 20–350 K. These fits indicate that at temperatures below 200 K, the rate coefficient for this reaction shows inverse temperature dependence, while above 200 K the reaction shows insignificant temperature dependence. © 2002 Wiley Periodicals, Inc. Int J Chem Kinet 34: 339–344, 2002