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Hydrogen-deuterium substitution in solid ethanol by surface reactions at low temperatures

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Title: Hydrogen-deuterium substitution in solid ethanol by surface reactions at low temperatures
Authors: Oba, Yasuhiro Browse this author
Osaka, Kazuya Browse this author
Chigai, Takeshi Browse this author
Kouchi, Akira Browse this author
Watanabe, Naoki Browse this author
Keywords: astrochemistry
ISM: clouds
ISM: molecules
Issue Date: 18-Jul-2016
Publisher: Oxford University Press
Journal Title: Monthly notices of the royal astronomical society
Volume: 462
Issue: 1
Start Page: 689
End Page: 695
Publisher DOI: 10.1093/mnras/stw1714
Abstract: Ethanol (CH3CH2OH) is one of the most abundant complex organic molecules in star-forming regions. Despite its detection in the gas phase only, ethanol is believed to be formed by low temperature grain-surface reactions. Methanol, the simplest alcohol, has been a target for observational, experimental, and theoretical studies in view of its deuterium enrichment in the interstellar medium; however, the deuterium chemistry of ethanol has not yet been an area of focus. Recently, deuterated dimethyl ether, a structural isomer of ethanol, was found in star forming regions, indicating that deuterated ethanol can also be present in those environments. In this study, we performed laboratory experiments on the deuterium fractionation of solid ethanol at low temperatures through a reaction with deuterium (D) atoms at 10 K. Hydrogen (II)-D substitution, which increases the deuteration level, was found to occur on the ethyl group but not on the hydroxyl group. In addition, when deuterated ethanol (e.g. CD3CD2OD) solid was exposed to H atoms at 10 K, D-H substitution that reduced the deuteration level occurred on the ethyl group. Based on the results, it is likely that deuterated ethanol is present even under H-atom-dominant conditions in the interstellar medium.
Rights: This article has been accepted for publication in Monthly notices of the royal astronomical society, © 2016,Oba, Yasuhiro; Osaka, Kazuya; Chigai, Takeshi; Kouchi, Akira; Watanabe, Naoki, Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大場 康弘

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