Behavior of molecules on interstellar grains - Application of the Langevin equation and iterative extended Hueckel

Details Behavior of molecules on interstellar grains - Application of the Langevin equation and iterative extended Hueckel Behavior of molecules on interstellar grains - Application of the Langevin equation and iterative extended Hueckel

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..149a&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 149-164.

Physics

Atomic Physics

7

Atomic Physics, Cosmic Dust, Hueckel Theory, Interstellar Matter, Langevin Formula, Molecular Gases, Desorption, Grains, Iterative Solution

Scientific paper

The Langevin equation was used to explore an adsorbate desorption mechanism. Calculations were performed using iterative extended Hueckel on a silica model site with various small adsorbates, e.g., H, CH, OH, NO, CO. It was found that barriers to free traversal from one site to another are substantial (about 3-10 eV). A bootstrap desorption mechanism for some molecules in the process of forming at a site also became apparent from the calculations. The desorption mechanisms appear to be somewhat balanced by a counterforce - the attraction of sites for the newly desorbed molecule. The order of attraction to a silica grain site for the diatomic molecules considered was OH greater than CH greater than CO greater than NO, when these entities were sufficiently distant. The nature of the silica grain and that of the 'cold' desorption mechanism, when considered together, suggest that the abundance of very small grains might be less common than anticipated.

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