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The bonding of H to the (111) surfaces of Ni, Pd, and Pt has been studied with use of angle-resolved photoelectron spectroscopy. H adsorbed onto a cooled substrate produces photoemission spectra characteristic of chemisorption. In this state the H atoms form an ordered overlayer. Heating the chemisorbed layer to 300 K results in an irreversible transition of the H atoms into a subsurface site.
Eberhardt et al. (Mon,) studied this question.
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