Abstract
Rate coefficients for the reaction OH+HBr → Br+H2O have been measured at 298 K using two different experimental techniques: (1) 266 nm pulsed laser photolysis of O3/H2O/HBr/He mixtures followed by time resolved resonance fluorescence detection of OH (LFP-RF) and (2) 248 nm pulsed laser photolysis of H2O2/HBr/Ar mixtures followed by pulsed laser induced fluorescence detection of OH (LFP-LIF). In both sets of experiments, the HBr concentration was monitored in situ in the slow flow system by UV photometry. Measured rate coefficients in units of 10−12 cm3 molecule−1 s−1 are 11.4±0.3 (LFP-RF) and 10.7±0.3 (LFP-LIF) where the uncertainties are 2σ and represent precision only. The absolute accuracy of the results is estimated to be ±10%. The experimental k1 values are in good agreement with a previous LFP-RF study in our laboratory but significantly faster than values reported by several other groups.
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