期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 712, 期 2, 页码 L174-L178出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/712/2/L174
关键词
astrochemistry; ISM: clouds; ISM: molecules; molecular processes
资金
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [21540502, 21200048] Funding Source: KAKEN
Surface reactions between carbon monoxide and non-energetic hydroxyl radicals were carried out at 10 K and 20 K in order to investigate possible reaction pathways to yield carbon dioxide in dense molecular clouds. Hydroxyl radicals, produced by dissociating water molecules in microwave-induced plasma, were cooled down to 100 K prior to the introduction of CO. The abundances of species were monitored in situ using a Fourier transform infrared spectrometer. Formation of CO2 was clearly observed, even at 10 K, suggesting that reactions of CO with OH proceed with little or no activation barrier. The present results indicate that CO2 formation, due to reactions between CO and OH, occurs in tandem with H2O formation, and this may lead to the formation of CO2 ice in polar environments, as typically observed in molecular clouds.
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