Abstract
The fluorine-Kα and chlorine-Kβ emission spectra in fluorescence from a series of alkali halides MX (M=Li, Na, K, Rb and Cs; X=F and Cl) are measured with a high-resolution two-crystal spectrometer. Solid-state effects are observed on the intensities of the K1L1 and Kβx satellite peaks in the Kα and Kβ emission spectra, respectively. An anomalously low intensity of the K1L1 satellite peak is observed for KF. The measured emission spectra are presented along with the UPS spectra of the F− 2p and Cl− 3p valence bands obtained by Poole et al., the fluorine K absorption-edge spectra by Nakai et al. and the chlorine K absorption-edge spectra by the author. By using these spectra, the first shoulder at the K absorption edge is identified as being due to a core exciton, the energy level of which is formed below the bottom of the conduction band. The binding energy of the exciton is estimated.
