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J. Phys.: Condens. Matter 6 (1994) pp. 7227-7237

Unoccupied electronic states in Au(100) surfaces

F. Ciccacci, S. De Rossi, and A. Taglia

Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, I-20133 Milano, Italy

S. Crampin

Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom

Abstract
We present a joint experimental and theoretical work on the emply electronic states of Au(100) surfaces. Bothe the stable 5 x 10 reconstructued and the metastable defect-stabilised 1 x 1 surfaces have been investigated by means of angle-resolved inverse photoemission, and the electronic structure has been determined theoretically for the 1 x 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 x 1 surface gives generally good agreement for the bulk transitions, but suggests that surface defects strongly influence surface states localised near the surface layer.