Abstract
Adsorption of hydrogen on polycrystalline palladium has been investigated using ESD techniques. Although a single thermal desorption peak is observed for H 2 and Pd, total ESD cross section measurements suggest the existence of four distinct sources for desorbing H + and H − species. The very large cross section associated with the H − signal along with its behavior during sample heating suggests the possible existence of a molecular precursor state.
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