Giant Temperature Dependence of Photoemission from the Silver Halides

Abstract

Anamalous temperature-dependent photoemission has been measured from the silver halides. Structure in the photoelectron energy distributions sharpens dramatically as samples are cooled from 295 to 80°K. We believe this is due to a lattice vibrationally dependent hybridization of the halogen $p$ and silver $d$ valence states. Using this effect, we have experimentally located the Ag states with almost pure $4d$ symmetry at 3.7 and 3.3 eV below the highest valence states in AgBr and AgCl, respectively.