The formation of H_2 and HD with the master equation approach

Details The formation of H_2 and HD with the master equation approach The formation of H_2 and HD with the master equation approach

2005-09-29

arxiv.org/abs/astro-ph/0509871v1

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures. IAU symposium 231 conference proceedings

Scientific paper

10.1017/S1743921306007368

The formation of H2 and HD molecules on interstellar dust grains is studied using rate equation and master equation models. Rate equations are used in the analysis of laboratory experiments which examine the formation of molecular hydrogen on astrophysically relevant surfaces. However, under interstellar conditions, rate equations are not suitable for the calculation of reaction rates on dust-grain surfaces. Due to the low flux and the sub-micron size of the grains, the populations of H and D atoms on a single grain are likely to be small. In this case the reaction rates are dominated by fluctuations and should be calculated using stochastic methods. The rate of molecular hydrogen formation in interstellar clouds is evaluated using the master equation, taking into account the distribution of grain sizes.

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