Rate measurements of reactions of OH by resonance absorption. Part 5.—Rate constants for OH + NO2(+M)→ HNO3(+M) over a wide range of temperature and pressure
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 72, 1459-1468
- https://doi.org/10.1039/f29767201459
Abstract
The kinetics of the reaction OH + NO2(+M)→ HNO3(+M) have been studied, using flash photolysis to generate OH radicals and time-resolved resonance absorption to observe the rate of their removal. Effective second-order rate constants, k1=(–d ln [OH]/dt)/[NO2], have been determined for the ranges: 220 ⩽T⩽ 550 K and 3.2 × 1017⩽[M]⩽ 1.6 × 1019 molecule cm–3. In this range of [M] the kinetics are in the changeover region between third- and second-order, but values of limiting low and high pressure rate constants have been found using an interpolation procedure due to Troe. Most of the experiments have been carried out with M = N2 but results have also been obtained with M = He, Ar, O2 and SF6.Keywords
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