West, NA orcid.org/0000-0002-3847-8478, Millar, TJ, Van De Sande, M et al. (4 more authors) (2019) Measurements of Low Temperature Rate Coefficients for the Reaction of CH with CH₂O and Application to Dark Cloud and AGB Stellar Wind Models. Astrophysical Journal, 885 (2). 134. ISSN 0004-637X
Abstract
Rate coefficients have been measured for the reaction of CH radicals with formaldehyde, CH₂O, over the temperature range of 31–133 K using a pulsed Laval nozzle apparatus combined with pulsed laser photolysis and laser-induced fluorescence spectroscopy. The rate coefficients are very large and display a distinct decrease with decreasing temperature below 70 K, although classical collision rate theory fails to reproduce this temperature dependence. The measured rate coefficients have been parameterized and used as input for astrochemical models for both dark cloud and Asymptotic Giant Branch stellar outflow scenarios. The models predict a distinct change (up to a factor of two) in the abundance of ketene, H₂CCO, which is the major expected molecular product of the CH + CH₂O reaction.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019. The American Astronomical Society. All rights reserved. This is an author produced version of a paper published in The Astrophysical Journal. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Astrochemistry; Circumstellar envelopes; Dense interstellar clouds; Experimental techniques; Laboratory astrophysics; Reaction rates |
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) |
Funding Information: | Funder Grant number EU - European Union 646758 |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Oct 2019 15:36 |
Last Modified: | 16 Nov 2019 10:36 |
Status: | Published |
Publisher: | American Astronomical Society |
Identification Number: | 10.3847/1538-4357/ab480e |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:151562 |