Decay of core holes in cesium chloride studied by the luminescence spectroscopy

Abstract

The relaxation of the electronic excitations created in the CsCl single crystal after the Auger decay of Cs + 4d core hole was studied by the measurements of crossluminescence (CL), STE emission, excitation spectra and decay kinetics in the energy range 70–140 eV and at temperatures from 10 to 350 K using synchrotron radiation from the SRS storage ring. CL decay time at hv > 80 eV decreased with temperature in the range 10–150 K, then increased with it up to 350 K, but did not reach the value observed at 10 K. At 140 K < T < 350 K and excitation energies hv > 80 eV, a molecular-type band structure with the separation between the peaks of ~ 0.24 eV superimposed over the CL emission spectrum was observed similar to the CN − spectrum in other alkali halides. Possible relaxation channels for the electronic excitations involved are discussed.