A laser flash photolysis kinetics study of the reaction OH+H2O2→HO2+H2O

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Abstract
Absolute rate constants for the reaction OH+H2O2→k1HO2+H2O are reported as a function of temperature over the range 273<T2O2 and detected by resonance fluorescence. H2O2 concentrations were determined in situ in the slow flow system by UV photometry. An unweighted linear least squares analysis of the ln k1 vs T−1 data gives the Arrhenius expression k1 = (3.7±0.6)×10−12exp[−(260±50)/T] cm3 molecule−1 s−1, where the errors are 2σ and refer to precision only. The estimated accuracy of each k1(T) is ±20%. Our results confirm the findings of two recent discharge flow–resonance fluorescence studies that the title reacton is considerably faster, particularly at temperatures below 300 K, than all earlier studies had indicated.