How are CH3OH, HNC/HCN, and NH3 Formed in the Interstellar Medium?

Details How are CH3OH, HNC/HCN, and NH3 Formed in the Interstellar Medium? How are CH3OH, HNC/HCN, and NH3 Formed in the Interstellar Medium?

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..855...86h&link_type=abstract

ASTROCHEMISTRY: From Laboratory Studies to Astronomical Observations. AIP Conference Proceedings, Volume 855, pp. 86-99 (2006).

Biology

2

Atomic, Molecular, And Chemical, And Grain Processes, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds, Chemical Reactions, Energy Disposal, And Angular Distribution, As Studied By Atomic And Molecular Beams, Astrobiology And Astrochemistry Of The Solar System And Interplanetary Space

Scientific paper

Simulation experiments for the formation of CH3OH, HNC/HCN, and NH3 in solid-phase reactions were performed. CH3OH and H2CO were formed as major products from the 100 eV electron-irradiated mixed CH4/H2O solid at 10 K. There 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 irradiation with the 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.
A mixed gas of N2/HCN (50/1) at a few Torr was activated by a dc discharge and was deposited on the gold-plated copper substrate at 10, 15, and 20 K. During the deposition of plasma-activated sample gas, D atoms produced by the dc discharge of D2 were simultaneously sprayed over the solid film. The association reactions of CN with D at 10 K were found to generate DNC and DCN with the intensity ratio DNC/DCN of about 3 in the infrared absorption spectra. This high ratio is in line with the high abundance ratios of HNC/HCN observed in the dark clouds. The formation of DNC and DCN became negligible at 20 K, due to the decrease of the sticking probability of D atoms on the solid surface. Ammonia was not detected as a reaction product from reaction of D with N atoms trapped in the N2 matrix.

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