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Efficient Formation Pathway of Methyl Formate: The Role of OH Radicals on Ice Dust

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Title: Efficient Formation Pathway of Methyl Formate: The Role of OH Radicals on Ice Dust
Authors: Ishibashi, A. Browse this author
Hidaka, H. Browse this author
Oba, Y. Browse this author
Kouchi, A. Browse this author →KAKEN DB
Watanabe, N. Browse this author →KAKEN DB
Issue Date: Nov-2021
Publisher: IOP Publishing
Journal Title: Astrophysical journal letters
Volume: 921
Issue: 1
Start Page: L13
Publisher DOI: 10.3847/2041-8213/ac3005
Abstract: Three structural isomers of the C2H4O2 molecule, namely, methyl formate (MF; HCOOCH3), acetic acid (CH3COOH), and glycolaldehyde (HOCH2CHO), have attracted considerable attention as targets for understanding pathways toward molecular complexity in the interstellar medium (ISM). Among these isomers, MF is decisively abundant in various astronomical objects. For various formation pathways of MF, surface reactions on cosmic dust would play an important role. However, when compared to observations, the formation of MF has been found to be relatively inefficient in laboratory experiments in which methanol (CH3OH)-dominant ices were processed by ultraviolet photons and cosmic-ray analogs. Here, we show experimental results on the effective formation of MF by the photolysis of CH3OH on water ice at 10 K. We found that the key parameter leading to the efficient formation of MF is the supply of OH radicals by the photolysis of H2O, which significantly differs from CH3OH-rich experimental conditions. Moreover, using an ultrahigh-sensitivity surface analysis method, we succeeded in constraining the decisive formation pathway of MF via the photolysis of methoxymethanol (MM; CH3OCH2OH), which would improve our current understanding of chemical evolution in the ISM.
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: 渡部 直樹

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