Luminescence from Exciton and V K -Plus-Electron States in Alkali Halide Crystals

摘要: After reviewing briefly the relevant experimental data on exciton luminescence, it is shown by a calculation KCl that cubic relaxation alone cannot explain results for emission energy. A model set up local of crystal into ${V}_{K}$-like or diatomic molecule configuration. Claculations with this show can give correct energy in KCl, NaI, KI, and RbI. Furthermore, able to provide an understanding symmetry properties excition states as deduced from experiments using polarized light. The lifetimes be understood terms magnitude Stokes shift degree localization one-particle function describes excited electron. Activation energies disappearance bands obtained model. concept "noncrossing levels" which important molecular theory plays prominent role explaining data.