A Model of Resonant Raman Scattering via Virtual Exciton

抄録

A model of the resonant Raman scattering (RRS) is constructed, in which optically created exciton is resonantly decomposed into an electron in the continuum and a localised hole. This RRS via virtual exciton results in the so called double resonance and enhancemernt of q\simeq0 LO phonon scattering in an appropriate condition. If the p–s exciton in this model is replaced by the 4f–5d exciton, this model presents one of the possible mechanisms which explain the sharp RRS of q\simeq0 LO phonon observed in rare-earth chalcogenides in spite of its forbidden symmetry.