Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...712l.174o&link_type=abstract
The Astrophysical Journal Letters, Volume 712, Issue 2, pp. L174-L178 (2010).
Astronomy and Astrophysics
Astronomy
18
Astrochemistry, Ism: Clouds, Ism: Molecules, Molecular Processes
Scientific paper
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.
Hama Tetsuya
Kouchi Akira
Oba Yasuhiro
Pirronello Valerio
Watanabe Naoki
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