Reaction kinetics involving ground X2Π and excited A2Σ+hydroxyl radicals. Part 1.—Quenching kinetics of OH A2Σ+and rate constants for reactions of OH X2Π with CH3CCl3and CO
- 1 January 1979
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 75, 569-581
- https://doi.org/10.1039/f29797500569
Abstract
Resonance fluorescence has been used to determine the rate constants k1 and k2(cm3 molecule–1 s–1)(1 σ) of elementary reactions of ground state OH X2Π radicals from 293 to 430 K: OH + CH3CCl3[graphic omitted]CH2CCl3+ H2O (1), log10k1=(–11.62 ± 0.14)–(1394 ± 113)/2.303 T; OH + CO [graphic omitted] CO2+ H (2), k2=(–12.66 ± 0.12)–(88 ± 40)/2.303 T. In addition, steady-state measurements of resonance fluorescence have been used to determine the rate constants at 293 K for electronic (or reactive) quenching of excited OH A2Σ+ radicals with a variety of halogenocarbon molecules. Most of these excited-state quenching reactions occur with collision efficiencies approaching unity at 293 K, unlike the corresponding reactions involving ground state OH radicals.Keywords
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