Pulsed laser photolysis study of the reaction between O(3P) and HO2

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Abstract
The kinetics of the reaction O(3P)+HO2 → k1OH+O2 (1) has been investigated at 298 K as a function of N2 diluent gas pressure from 10 to 500 Torr. O(3P) was produced via 248.5 nm KrF laser photolysis of O3 followed by the rapid quenching of the O(1D) to O(3P) by N2 and HO2 was produced via simultaneous photolysis of H2O2 (by the same laser) to create OH radicals which in turn reacted with H2O2 to yield HO2. The O(3P) temporal profile was monitored via the time resolved resonance fluorescence technique. [HO2] was calculated based on known and experimentally measured parameters. The measured value of k1 was independent of N2 pressure with a mean value of (6.2±1.1)×10−11 cm3 molecule−1 s−1, where the error represents 2 σ and includes estimates of systematic errors in the determination of [HO2]. This work is the first study where reaction (1) has been investigated under pseudo‐first order conditions at pressures greater than a few Torr. Also, these experiments represent the first time the described techniques have been employed for studying radical–radical reactions.

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