Interstellar molecules - Direct formation on graphite grains

Details Interstellar molecules - Direct formation on graphite grains Interstellar molecules - Direct formation on graphite grains

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197..341b&link_type=abstract

Astrophysical Journal, vol. 197, Apr. 15, 1975, pt. 1, p. 341-345.

Physics

17

Cosmic Dust, Graphite, Interstellar Matter, Molecular Physics, Atomic Collisions, Carbon Disulfide, Hydrocarbons, Interstellar Extinction, Recombination Reactions

Scientific paper

It is demonstrated experimentally that ground-state atoms of oxygen, hydrogen, and sulfur, thermalized to 78 K, can, upon impinging on graphite grains, produce carbon monoxide and carbon dioxide, a variety of hydrocarbons, and carbon disulfide. Since interstellar extinction curves indicate the existence of bare graphite surfaces in the clouds, it is suggested that direct chemical reactions of atoms with graphite grains supply a considerable number of these molecules to the clouds. In clouds where the temperatures are not much below 78 K, the carbon oxides and most of the hydrocarbons will evaporate from the grains and will not contribute to mantle growth.

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