Reaction of OH + NO2 + M: Kinetic evidence of isomer formation
- 21 May 2002
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 4 (13) , 2959-2964
- https://doi.org/10.1039/b201932a
Abstract
The objective of this paper is twofold: First, we present new experimental data on the reaction of OH+NO2 at room temperature, which show that the results obtained earlier in our laboratory (see []) are about 30% too high. Secondly, we provide direct experimental evidence, that peroxynitrous acid (HOONO) is formed in the title reaction: At temperatures between 430 and 480 K we observe bi-exponential OH loss over the complete pressure range (1–130 bar) studied, which certainly supports the formation of the HOONO isomer. We determined the equilibrium constant for the OH+NO2 ⇔HOONO reaction as a function of temperature and extracted from a 3rd-law analysis an O–O bond energy in the HOONO of ΔH°(0 K)=83±1 kJ mol−1.Keywords
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