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Surface state on clean Tb(0001).

Angle-resolved photoemission experiments on clean Tb(0001) reveal the existence of a state 0.5 eV below the Fermi level which has the properties of a surface state. It exhibits no dispersion with respect to the momentum component perpendicular to the surface in the photon-energy range between 15 and 55 eV; it is located in a band gap of the projected band structure at {bar {Gamma}}; and it is very sensitive to oxygen contamination of the surface. The wave function of this surface state has {Delta}{sub 1} symmetry, as the intensity of the photoemission peak decreases when the {ital p} component of the exciting radiation is reduced. Both the very weak energy dispersion with respect to the parallel component {ital k}{sub } of the momentum and the photon-energy dependence of the photoionization cross section indicate that the surface state has 5{ital d}{sub {ital z}}{sup 2} orbital character. The existence of this surface state can be explained by the same theory of surface core-level shifts that is related to the narrowing of the surface density of {ital d} states in transition metals.