Interstellar grain explosions - Molecule cycling between gas and dust

Details Interstellar grain explosions - Molecule cycling between gas and dust Interstellar grain explosions - Molecule cycling between gas and dust

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109l..12d&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 2, May 1982, p. L12-L14. Research supported by the Netherlands Foundation for Astrono

Astronomy and Astrophysics

Astrophysics

85

Astronomical Models, Chemical Energy, Cosmic Dust, Interstellar Gas, Interstellar Matter, Molecular Clouds, Photolysis, Carbon Monoxide, Ultraviolet Radiation, Water

Scientific paper

Results are presented of experiments designed to duplicate the relevant physical conditions of interstellar grain mantles in order to obtain data required to test the hypothesis that molecule ejection from vacuum ultraviolet photolyzed grain mantle analogs provide the basic mechanism for the equilibrium between accretion on and ejection from grains of small condensible molecules in dense molecular clouds. The experiment involves depositing mixtures of simple gases as a thin film onto the surface of an aluminum block cooled to 10 K, the photolysis of the samples with vacuum UV radiation, and infrared spectroscopy of the chemical evolution and the production of frozen radicals. It is shown that, when equilibrium exists between accretion and evaporation, it is possible to derive a mean fraction of the condensible species present in the gas, which in turn is applied to CO to derive the ratio of CO to molecular hydrogen expected in clouds. The role that this process plays in a model cloud is discussed.

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