LOCALIZATION OF D-LIKE SURFACE RESONANCES ON RECONSTRUCTED AU(111)

We have investigated d-like surface resonances observed already earlier on the reconstructed Au(111)(22 X square-root 3) surface at initial-state energies E1 = - 5.65 and - 4.25 eV relative to E(F). At sample temperatures below T = 100 K a non-reconstructed Au(111) surface can be prepared by gentle bombardment with Ne+ at 200 eV. It exhibits sufficient order to show a clear (1 x 1) pattern. However, the above-mentioned surface resonances are missing in angle-resolved normal-emission photoelectron spectra from the (1 x 1) face. This observation proves that the surface resonance states are spatially localized within the outermost corrugated atomic layer of the reconstructed surface.