An excited state of alkali halides

Abstract

Using the theory of optical absorption by free Frohlich polarons, the excited states of the electronic polaron complex are computed. Both the free and bound complexes are discussed. A simple model of bound case is also presented. Optical absorption due to the interaction of electron and polarization field yields the creation of electronic polarons with the resonant emission of a longitudinal exciton, beginning at about twice the exciton frequency. Peaks corresponding to this absorption had been identified with plasma excitations.