Photoemission Electron Spectroscopy III: Satellites by Extended Excitations

Abstract

  Photoemission process leaves the target system in several final states that are lacking one electron with respect to the initial state. Except for the trivial noninteracting case, the final state effect leads to nontrivial features in the photoemission electron spectroscopy (PES). They are distinguished as the main feature and its satellites. In this issue, we discuss the satellite features in PES when the final state is reached by the extended excitations, that is, corresponding to the collective excitations of charges, spins, or vibrations. In particular, we focus on the basic PES problems of the metallic system with the Fermi sea of conduction electrons.