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Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40-60 K

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Title: Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40-60 K
Authors: Oba, Yasuhiro Browse this author
Watanabe, Naoki Browse this author →KAKEN DB
Kouchi, Akira Browse this author →KAKEN DB
Hama, Tetsuya Browse this author
Pirronello, Valerio Browse this author
Issue Date: 21-Sep-2011
Publisher: Royal Society of Chemistry
Journal Title: Physical Chemistry Chemical Physics
Volume: 13
Issue: 35
Start Page: 15792
End Page: 15797
Publisher DOI: 10.1039/c1cp20596j
PMID: 21727985
Abstract: We investigated the OH-related formation routes of two astrophysically important molecules, H2O and CO2, under relatively warm astrophysical conditions. OH radicals, together with other neutral species such as H, O, H2, and O2, were produced in H2O microwave-discharge plasma and cooled to 100 K before being deposited on an Al substrate at 40-60 K. H2O formed at 40 and 50 K, but not at 60 K. Taking the experimental conditions into account, a possible route of H2O formation is via reactions involving OH + OH, which yield H2O2 as the main reaction product. The present study is the first to show experimentally that surface reactions of two OH radicals can yield H2O at low temperatures. The products' branching ratio was 0.2 and 0.8 for H2O and H2O2, respectively. When CO was co-deposited with neutral species that formed in the H2O plasma, CO2 was formed at 40-60 K. H2CO3 formed at 40 and 50 K. The present results may suggest that chemical reactions related to OH radicals are effective at yielding various molecules in relatively warm astrophysical environments, such as protostars.
Rights: Phys. Chem. Chem. Phys., 2011, 13(35), 15792-15797 - Reproduced by permission of the PCCP Owner Societies
Type: article (author version)
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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