Influence of surface morphology on surface states for Cu on Cu(111)

We have exploited angle-resolved one-photon photoemission, two-photon photo emission, and spot-profile analysis of low-energy electron diffraction to m onitor the influence of surface morphology on the occupied and empty surfac e states observed at Gamma on Cu(111). Surface morphology changes were indu ced by homoepitaxial growth of Cu on Cu(111). A simple model of electron lo calization on terraces successfully explains energy shifts and linewidth br oadening of both surface states. Obviously, surface states may be used as s ensitive probes of terrace-width distributions and other structural propert ies.