Mathematics – Probability
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0331v&link_type=abstract
American Astronomical Society, AAS Meeting #212, #3.31; Bulletin of the American Astronomical Society, Vol. 40, p.190
Mathematics
Probability
Scientific paper
Formation of H2 in interstellar gas occurs primarily via surface reactions on grains. A key parameter in determining the efficiency of H2 formation is the probability for H to stick to the surface. Once H2 is formed it may return to the surface and participate in further reactive processes. However, little is known about the sticking probability of H2 on grains. Simulations of the sticking coefficient for molecular hydrogen on the icy mantles of interstellar dust using a model based on classical molecular dynamics (MD) are being developed. The current study is on a simulated surface of amorphous ice with molecular hydrogen incident on the surface with different velocities. After a series of MD runs with different set of initial conditions based on the observed and known interstellar dust and gas temperatures, the sticking coefficient is then calculated as a function of the gas and dust temperatures. Preliminary results of these simulations will be presented at the meeting.
This project is supported by NASA grant NNG06GJ11G from the Astrophysics Theory Program
Lewis Steven P.
Stancil Phillip C.
Takahashi Jun
Veeraghattam Vijay
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