Contributions from surface-modified bulk electronic bands to the reflection anisotropy ofAu(110)-(1 × 2)

Abstract

We investigate the temperature dependence of the optical reflectance anisotropy (RA) of theAu(110)-(1 × 2) surface and find that transitions involving surface-modified bulk bands contribute to theRA spectrum. The RA peaks observed at room temperature at photon energies of 3.52 and4.50 eV are assigned to the transitions and , respectively. The assignments are based upon a comparison between temperature-inducedshifts in the energy of these RAS peaks and thermovariation optical spectroscopy results ofthe temperature dependence of transition energies between bands at the L symmetry point.The application of RAS to Au(110) can be seen as a model system for exploring surfaces ina range of environments including ultra-high vacuum, high pressures and at the solid/liquidinterface. The results reported here further the understanding of the RA spectrum of theclean Au(110) surface.