Caravan, RL, Shannon, RJ, Lewis, T et al. (2 more authors) (2015) Measurements of Rate Coefficients for Reactions of OH with Ethanol and Propan-2-ol at Very Low Temperatures. Journal of Physical Chemistry A, 119 (28). 7130 - 7137. ISSN 1089-5639
Abstract
The low temperature kinetics of the reactions of OH with ethanol and propan-2-ol have been studied using a pulsed Laval nozzle apparatus coupled with pulsed laser photolysis-laser-induced fluorescence (PLP-LIF) spectroscopy. The rate coefficients for both reactions have been found to increase significantly as the temperature is lowered, by approximately a factor of 18 between 293 and 54 K for ethanol, and by ∼10 between 298 and 88 K for OH + propan-2-ol. The pressure dependence of the rate coefficients provides evidence for two reaction channels: a zero pressure bimolecular abstraction channel leading to products and collisional stabilization of a weakly bound OH-alcohol complex. The presence of the abstraction channel at low temperatures is rationalized by a quantum mechanical tunneling mechanism, most likely through the barrier to hydrogen abstraction from the OH moiety on the alcohol.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry A after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jp505790m. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Low temperature kinetics; astrochemistry; quantum mechanical tunneling; hydrogen-bonded complex; Laval nozzle |
Dates: |
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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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 25 Aug 2015 15:17 |
Last Modified: | 28 Oct 2015 13:37 |
Published Version: | http://dx.doi.org/10.1021/jp505790m |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/jp505790m |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:85880 |