Hydrogen chemisorption on metals

Copper clusters, as reported by the Rice group(lc), do not react with hydrogen. Hydrogen chemisorption on copper surfaces is also an activated process. Surface beam scattering experiments place this barrier between 4-7 kcal/mole(33). This large value is consistent with the activated nature oT hydrogen chemisorption on metal clusters, and the trend toward bulk behavior for relatively small clusters (>25 atoms in size). 

It is hardly possible, and probably not very useful, to find the exact form for Instead, as frequently happens, much progress can be made by adopting a model Hamiltonian. The work of Blandin et al, Bloss and Hone and the earlier study of sputtering by Sroubek shows that a suitable one is the TDAN Hamiltonian, which is a generalization of the time-independent one originally introduced to discuss impurities in metals and later applied to hydrogen chemisorption on metals ... 

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