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

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タイトル: Hydrogen-deuterium substitution in solid ethanol by surface reactions at low temperatures
著者: Oba, Yasuhiro 著作を一覧する
Osaka, Kazuya 著作を一覧する
Chigai, Takeshi 著作を一覧する
Kouchi, Akira 著作を一覧する
Watanabe, Naoki 著作を一覧する
キーワード: astrochemistry
ISM: clouds
ISM: molecules
発行日: 2016年 7月18日
出版者: Oxford University Press
誌名: Monthly notices of the royal astronomical society
巻: 462
号: 1
開始ページ: 689
終了ページ: 695
出版社 DOI: 10.1093/mnras/stw1714
抄録: 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.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 大場 康弘


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