Efficiency of Molecular Hydrogen Formation on Silicates
V. Pirronello, O. Biham, C. Liu, L. Shen, G. Vidali
Abstract
We report on laboratory measurements of molecular hydrogen formation and recombination on an olivine slab as a function of surface temperature under conditions relevant to those encountered in the interstellar medium. On the basis of our experimental evidence, we recognize that there are two main regimes of H coverage that are of astrophysical importance; for each of them we provide an expression giving the production rate of molecular hydrogen in interstellar clouds.
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