Methanol Formation from Electron-irradiated Mixed H2O/CH4 Ice at 10 K

Details Methanol Formation from Electron-irradiated Mixed H2O/CH4 Ice at 10 K Methanol Formation from Electron-irradiated Mixed H2O/CH4 Ice at 10 K

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...644..300w&link_type=abstract

The Astrophysical Journal, Volume 644, Issue 1, pp. 300-306.

Astronomy and Astrophysics

Astronomy

14

Astrochemistry, Ism: Cosmic Rays, Ism: Molecules, Methods: Laboratory, Molecular Processes

Scientific paper

In order to investigate the role of cosmic rays in the formation of methanol on dust grains, low-energy electron irradiation (~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 10 K. 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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