Abstract
Synchrotron radiation in the 32-160-eV range was used to elucidate the role of bulk and surface effects in normal photoemission from the valence bands of a Cu(110) crystal. A dramatic resonance in the $s\ensuremath{-}p$ band was observed for photon energies $h\ensuremath{\nu}=43\ensuremath{-}52$ eV. We have used this resonance and the energy dependence of the spectra to study the role of surface-induced broadening of the momentum component perpendicular to the surface (${k}_{\ensuremath{\perp}}$). Our results strongly contradict previous interpretations of lower-energy studies in terms of a one-dimensional density of states along ${k}_{\ensuremath{\perp}}$. We find that normal photoemission, applied over a sufficient energy range, can be used to map the initial-state bulk band structure.
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