Binding Energy of the Core Exciton in the Cl^- L_<2,3> Absorption of Alkali Chlorides

概要

論文の詳細を見る
With a two-crystal vacuum spectrometer, the Cl^- Kα emission spectra in fluorescence are measured for a series of alkali chlorides MCl (M=Li, Na, K, Rb and Cs). By using the measured Kα emission spectra, the previously reported Cl^- Kβ emission spectra, ultraviolet photoelectron spectra, and optical-gap data, the energy position of the bottom of the conduction band is shown in the high-resolution Cl^- L_<2,3> absorption spectra of alkali chlorides obtained by Iguchi et al. The first sharp peak of the Cl^- L_<2,3> absorption is identified as being due to a core exciton, the energy level of which is formed below the bottom. The binding energies of the excitons are estimated to be 0.9 (±0.1), 1.2 (±0.1), 1.3 (±0.1), 1.1 (±0.1) and 0.7 (±0.1)eV for LiCl, NaCl, KCl, RbCl and CsCl, respectively.
社団法人日本物理学会の論文
1993-02-15