Mir, ZS orcid.org/0000-0003-2223-2833, Lewis, TR, Onel, L et al. (3 more authors) (2020) CH₂OO Criegee intermediate UV absorption cross-sections and kinetics of CH₂OO + CH₂OO and CH₂OO + I as a function of pressure. Physical Chemistry Chemical Physics, 22 (17). pp. 9448-9459. ISSN 1463-9076
Abstract
The UV absorption cross-sections of the Criegee intermediate CH2OO, and kinetics of the CH2OO self-reaction and the reaction of CH2OO with I are reported as a function of pressure at 298 K. Measurements were made using pulsed laser flash photolysis of CH2I2/O2/N2 gas mixtures coupled with time-resolved broadband UV absorption spectroscopy at pressures between 6 and 300 Torr. Results give a peak absorption cross-section of (1.37 ± 0.29) × 10−17 cm2 at ∼340 nm and a rate coefficient for the CH2OO self-reaction of (8.0 ± 1.1) × 10−11 cm3 s−1, with no significant pressure dependence of the absorption cross-sections or the self-reaction kinetics over the range investigated. The rate coefficient for the reaction between CH2OO and I demonstrates pressure dependence over the range investigated, with a Lindemann fit giving k0 = (4.4 ± 1.0) × 10−29 cm6 s−1 and k∞ = (6.7 ± 0.6) × 10−11 cm3 s−1. The origins of IO in the system have been investigated, the implications of which are discussed.
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Copyright, Publisher and Additional Information: | This journal is © the Owner Societies 2020. This is an author produced version of an article published in Physical Chemistry Chemical Physics. Uploaded in accordance with the publisher's self-archiving policy. | ||||||
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Institution: | The University of Leeds | ||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) | ||||||
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Depositing User: | Symplectic Publications | ||||||
Date Deposited: | 09 Apr 2020 10:38 | ||||||
Last Modified: | 13 Apr 2021 00:38 | ||||||
Status: | Published | ||||||
Publisher: | Royal Society of Chemistry | ||||||
Identification Number: | https://doi.org/10.1039/D0CP00988A |