Angle and Energy Dependence of Photoemission from NaCl and KCl Single Crystals

Abstract
The dependence of photoemission on the azimuthal emission angle at fixed polar angle of 45° was measured for the (100) face of NaCl and KCl single crystal cleaved in situ. The initial- and final-state energy was scanned using synchrotron radiation. Strong variations of the angular pattern are observed for different final-state energies. Below the electron-electron scattering threshold the pattern depends only on the final-state energy. Electron-phonon scattering can account for this fact.