Issue |
A&A
Volume 391, Number 3, September I 2002
|
|
---|---|---|
Page(s) | 1069 - 1080 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20020838 | |
Published online | 09 August 2002 |
On the master equation approach to diffusive grain-surface chemistry: The H, O, CO system
1
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, herbst@mps.ohio-state.edu
Received:
15
May
2002
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.