Abstract
Surface-limited kinetics of hydrogen release and uptake in metals are derived for arbitrary surface coverage. Aside from the usual uptake mechanism in which, after disassociation of the molecule, two hydrogen atoms thermalize at the surface before entering the bulk, cases in which one or both go directly into the bulk are considered. Release involves the inverses of these processes which are obtained from considerations of detailed balance which involve site energies only. On release the processes may be distinguished by dependence of the steady-state escape rate on bulk concentration in the limit of high coverage. As well as presenting new results and correcting some errors in a previous treatment by Baskes, this work reviews previous treatments so as to be self-contained.
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