Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.337s&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
Knowledge of the physical and chemical processes of amorphous ice is important for understanding the chemical and dynamical evolution of the interstellar medium (ISM). At the surface of icy mantles of interstellar grains adsorption, diffusion, chemical reactions and desorption of atoms and molecules occur. We attempt to understand H atom diffusion on amorphous ice in order to have better understanding of the formation of H_2, and other hydrogen containing molecules, in the ISM. Our current study of H atom diffusion on amorphous ice at low temperature is presented, where we have used transition state theory and the kinetic Monte Carlo method to calculate the rate of diffusion. The results for amorphous ice are compared to those of crystalline ice and the results are used to interpret recent experimental results on the reactivity of H atoms at ice surfaces. We also discuss the relative importance of quantum tunneling and over-the-barrier "thermal hopping" in diffusion jumps at different temperatures.
Andersson Sebastian
Nyman Göran
Senevirathne Bethmini
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