Abstract
The unoccupied Shockley surface states of the Ni(110) surface have been investigated by inverse photoemission on the clean and the H covered surface. The H/Ni(110) adsorption system forms a two-dimensionally ordered (1 × 2) phase at low temperature and a one-dimensionally ordered “streaky” (1 × 2) phase at room temperature. On the two-dimensionally ordered phase all surface states are down-shifted due to the attractive protonic potential of the adsorbed H. On the one-dimensionally ordered phase those surface states which propagate in the direction of the perturbed periodicity, i.e. perpendicular to the atom rows of the reconstructed H/Ni(110) surface, are completely quenched. The surface states which propagate along the rows in the direction where the periodicity is conserved are virtually unaffected by the disorder. This indicates that they are confined to individual atom rows representing truly one-dimensional surface states.
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