STUDY OF SURFACE-STATES ON CU(110) USING OPTICAL REFLECTANCE ANISOTROPY

We report spectroscopic measurements of the azimuthal anisotropy in th e normal incidence reflectivity of a clean and adsorbate-covered singl e-crystal metal surface: Reflectance anisotropy spectra were taken bet ween 1.5 and 6 eV from Cu(110). On the clean surface, a sharp resonanc e is found which is assigned to a transition between two surface state s at the (Y) over bar point of the surface Brillouin zone. The resonan ce can be removed by adsorption, and its energetic position is in good agreement with photoemission and inverse photoemission work.