Laboratory Synthesis of Molecular Hydrogen on Surfaces of Astrophysical Interest

Details Laboratory Synthesis of Molecular Hydrogen on Surfaces of Astrophysical Interest Laboratory Synthesis of Molecular Hydrogen on Surfaces of Astrophysical Interest

1996-11-04

arxiv.org/abs/astro-ph/9611022v2

Astronomy and Astrophysics

Astrophysics

13 pages plus 5 figures (only change: this version has 5 figures included); this paper is to appear in Astrophysical Journal L

Scientific paper

10.1086/310464

We report on the first results of experiments to measure the recombination rate of hydrogen on surfaces of astrophysical interest. Our measurements give lower values for the recombination efficiency (sticking probability S x probability of recombination upon H-H encounter $\gamma$) than model-based estimates. We propose that our results can be reconciled with average estimates of the recombination rate (1/2 n(H) n(g) v(H)A S $\gamma$) from astronomical observations, if the actual surface of an average grain is rougher, and its area bigger, than the one considered in models.

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