Unoccupied electronic states in Au(100) surfaces

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Abstract
We present a joint experimental and theoretical work on the empty states of Au(100) surfaces. Both the stable 5*10 reconstructed and the metastable defect-stabilized 1*1 surfaces have been investigated by means of angle-resolved inverse photoemission, and the electronic structure has been theoretically determined for the 1*1 surface within the local density approximation. The experimental spectra for the two surfaces are very similar, showing in both cases bulk derived transitions and a surface feature corresponding to the n=1 image-potential state. In the spectra from the metastable surface, a strong n=0 surface resonance is also observed. Comparison with theoretical calculations for the 1*1 surface gives generally good agreement for the bulk transitions, but suggests that surface defects strongly influence surface states localized near the surface layer.