Image-potential-induced resonances at free-electron-like metal surfaces

The formation of electronic image states at free-electron-like metal surfaces is described with a jellium model where the lattice-induced corrugation is included via a pseudopotential description. Comparison with inverse-photoemission experiments on Al(111) gives good agreement between the calculated and the measured resonant state energy. Statements are made about the possible resolution of such resonances at other metal surfaces.