Abstract
The role of adatom-adatom interactions in the formation of ordered structures on transition and noble metal surfaces is investigated with particular emphasis being placed on H adsorption on the close-packed surface of fcc or hcp metals. Multiple adatom interactions involving as many as six H adatoms in a number of high symmetry situations are calculated. Non-pairwise contributions tot he interaction energies are found to be small and a knowledge of the sums of the relevant pair interactions for a given overlayer structure is found to be sufficient to determine which of the chosen structures is energetically most stable. Long-range pair interactions are found to play an important role in determining the stability of a given ordered structure. Comparison with experiment for the H/ Ni(111) system is made and predictions for other H/metal systems are presented.
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