The desorption of CO from interstellar grains

Details The desorption of CO from interstellar grains The desorption of CO from interstellar grains

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..633g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 2, p. 633-640

Astronomy and Astrophysics

Astrophysics

5

Carbon Monoxide, Cosmic Dust, Desorption, Interstellar Matter, Silicon Dioxide, Trajectories, Langevin Formula, Molecular Excitation, Vibration Mode, Vibrational States

Scientific paper

We have studied the desorption of weakly bound, vibrationally excited CO molecules from bare silica dust particles. The method of classical trajectories has been utilized, with the grain modes being handled by the generalized Langevin equation. No desorption of 'quasi-bound' CO molecules has been found at vibrational energies up to the dissociation energy. The negative result can be attributed to the excitation of the dust grain vibrational modes. At CO energies of 9.0 eV and above, an appreciable number of so-called 'single turning point' trajectories leading to desorption have been found to occur for CO absorbed onto bare silica but the relevance of these trajectories to desorption under interstellar conditions is unclear. We have also considered an approximate model to describe the vibrational modes of grains covered by a mantle. Depending on the particular parameters chosen, appreciable desorption yields for 'quasi-bound' CO can occur at very high CO vibrational energies. For example, at ECO = 11.0 eV, more than a third of the trajectories can desorb within a time of 20 ps.

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