DECAY OF CORE HOLES IN CESIUM-CHLORIDE STUDIED BY THE LUMINESCENCE SPECTROSCOPY

The relaxation of the electronic excitations created in the CsCl singl e crystal after the Anger decay of Cs+ 4d core hole was studied by the measurements of crossluminescence (CL), STE emission, excitation spec tra and decay kinetics in the energy range 70-140 eV and at temperatur es from 10 to 350 K using synchrotron radiation from the SRS storage r ing. CL decay time at hv > 80 eV decreased with temperature in the ran ge 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 betwee n the peaks of similar to 0.24 eV superimposed over the CL emission sp ectrum was observed similar to the CN- spectrum in other alkali halide s. Possible relaxation channels for the electronic excitations involve d are discussed.