Chemical Desorption of CO in the Vicinity of H_2 Forming Sites on Dust

Details Chemical Desorption of CO in the Vicinity of H_2 Forming Sites on Dust Chemical Desorption of CO in the Vicinity of H_2 Forming Sites on Dust

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..375t&link_type=abstract

The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb

Physics

Scientific paper

Chemical desorption of an adsorbed CO molecule in the vicinity of H _2 forming sites on interstellar dust grains is investigated by a theoretical modelling based on a classical molecular dynamics (MD) computational simulation. As a model surface for icy mantles of dust grains, the amorphous water ice slab was generated at 10 K, and the first and the second H atoms were thrown onto the model surface to reproduce the two H atoms' recombination process, H + H --> H_2. Then, the time and space dependence of the local temperature of icy mantles was examined in the vicinity of H _2 forming sites. It was found that icy mantles are sufficiently heated locally by a small release of H _2 formation energy to cause desorption of an adsorbed CO molecule in the region within at least 7 Å from H _2 forming sites.

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