Photoemission Final-State Spectroscopy Applied to KCl

Abstract

A new method of taking uv photoemission data, employing synchrotron radiation, is described. The method has significant advantages for investigating final-state properties of interband transitions and for investigating many-body effects. Applying it to KCl, strong peaks in the conduction-band density of states are located at 9.7 and 12.6 eV. The data also suggest a probable interpretation of an optical-reflectance peak ($h\ensuremath{\nu}\ensuremath{\simeq}13$ eV) whose origin has been a matter of doubt.