Abstract
The existence of induced surface states in the 110 gap of a 110 alkali metal surface is investigated using a simple two-step model for the surface potential. The adsorbate is characterised by two parameters, the height E1 and width A of the intermediate step. Those values of E1 and A are determined for which localised surface states exist. The influence of transitions between occupied bulk states and empty surface states is studied by means of the effective dielectric function epsilon eff and the differential reflectance Delta R/R0. The calculated surface contribution to epsilon eff for all parameter sets agrees qualitatively with the experimental curves. The magnitude of the surface contribution depends sensitively on the parameters of the surface potential. This work suggests that the Mayer-El Naby anomaly (1963) in the alkali metal spectra originates in an induced surface state.
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