Abstract
Optical transitions between surface state bands have been detected on the Si(111)-Pb(√3 × √3) mosaic phase by means of surface differential reflectivity (SDR) in the energy range between 1.3 and 3.8 eV. The SDR spectrum, obtained between the clean and the hydrogenated surface, presents a broad structure in this energy range with a maximum at 3.0 eV. The spectrum has been deconvolved into three Gaussian singlets at energies 1.8, 2.5 and 3.05 eV. These transitions have been, tentatively, assigned to different points in the surface Brillouin zone. No contribution from the hydrogenated surface is expected, as observed by angle resolved photoemission.
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