Volume 391, Number 3, September I 2002
|Page(s)||1069 - 1080|
|Published online||09 August 2002|
On the master equation approach to diffusive grain-surface chemistry: The H, O, CO system
Department of Physics, The Ohio State University, Columbus, OH 43210, USA
2 Institute of Astronomy of the Russian Academy of Sciences, Moscow 109017, Russia
3 Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA
Corresponding author: E. Herbst, email@example.com
Accepted: 3 June 2002
We have used the master equation approach to study a moderately complex network of diffusive reactions occurring on the surfaces of interstellar dust particles. This network is meant to apply to dense clouds in which a large portion of the gas-phase carbon has already been converted to carbon monoxide. Hydrogen atoms, oxygen atoms, and CO molecules are allowed to accrete onto dust particles and their chemistry is followed. The stable molecules produced are oxygen, hydrogen, water, carbon dioxide (CO2), formaldehyde (H2CO), and methanol (CH3OH). The surface abundances calculated via the master equation approach are in good agreement with those obtained via a Monte Carlo method but can differ considerably from those obtained with standard rate equations.
Key words: ISM: abundances / ISM: molecules / molecular processes
© ESO, 2002
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