Interatomic radiative transition of a valence electron to inner core: Luminescence from Cs-Halides and RbF at room temperature

Abstract

Excitation spectra of luminescence in Cs-halides and RbF have been measured at room temperature using synchrotron radiation for energy range up to 40 eV. The excitation thresholds are at the incident photon energy 13.8 ± 0.2 eV for the 2.5 ≈ 5.6 eV luminescence from CsF, the 3.8 ≈ 6.2 eV luminescence from CsCl, and the 4.4 ≈ 6.2 eV luminescence from CsBr, and 17.0 ± 0.1 eV for 2.8 ≈ 6.2 eV luminescence from RbF. These luminescence (CV-luminescence) are explained in terms of interatomic radiative transition of valence electrons to deeper-lying core holes.