Methanol formation from electron-irradiated mixed H2O/CH4 ice at 10 K

被引：55

作者：

Wada, Akira ^{[1
]}

Mochizuki, Noritaka ^{[1
]}

Hiraoka, Kenzo ^{[1
]}

机构：

[1] Clean Energy Res Ctr, Kofu, Yamanashi 4008510, Japan

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 644卷 / 01期

关键词：

astrochemistry; cosmic rays; ISM : molecules; methods : laboratory; molecular processes;

D O I：

10.1086/503380

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In order to investigate the role of cosmic rays in the formation of methanol on dust grains, low-energy electron irradiation (similar to 10-300 eV) on mixed H2O/CH4 ice was studied by infrared (IR) spectroscopy and thermal desorption spectrometry (TDS). CH3OH was formed as a major product along with H2CO, C2H4, C2H6, and C2H2 as minor products when the mixed H2O/CH4 (10/1) ice was irradiated by electrons at 10K. There were found to be two pathways for the formation of methanol with about equal importance, i.e., the recombination reaction, CH3 + OH -> CH3OH, and the insertion reaction, CH2 + H2O -> CH3OH. One CH3OH molecule was formed per 60 electron irradiations with an electron energy of 100 eV. By using mixed H2O/CD4 ice, it was confirmed that formaldehyde was formed by the insertion reaction, C + H2O -> H2CO.

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页码：300 / 306

页数：7

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