Topics in inverse photoemission

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Abstract
Inverse photoemission (IPE) is now a well-recognized addition to the steadily growing arsenal of surface scientific tools. IPE makes accessible empty electronic bands in the energy region between the Fermi level and the vacuum level of solids and at surfaces. It provides the same detailed information on the electronic structure as ordinary photoemission, namely, energy, momentum, spin, and parity of energy bands. Several years of research have provided many results. This suggests addressing the question of what has been learned by these studies that could not have been inferred from our knowledge of ordinary photoemission (PES). Topics include image potential states at metal surfaces, relaxation phenomena in semiconductors, the role of the 2π level in the CO chemisorption bond, and contributions to the controversy ‘‘initial state effects versus final state screening’’ in the photoemission from adsorbed xenon.

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