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.
Vidali, Gianfranco; Pirronello, V; Liu, Chi; and Shen, Liyong, "Laboratory Synthesis of Molecular Hydrogen on Surfaces of Astrophysical Interest" (1996). Physics. 513.
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