Cl⁻L_2,3 Absorption Spectra of Alkali Chlorides, Silver Chloride and Thallous Chloride

Abstract

The Cl⁻L_2,3 absorption spectra of alkali chlorides, AgCl and TlCl have been measured using an ordinary X-ray tube with tungsten target as a radiation source. Measurements were performed carefully at 300°K, 90°K and 25°K over the photon energy range from 198 to 220 eV. The counting method for detection was more improved than in the previous report and a toroidal pre-reflector was used. Results are compared with the existing results of energy band calculation. It is concluded that sharp absorption bands near the threshold are caused by core-excitons with holes in the 2p level of chlorine.