Resonance Raman Scattering in Alkali Iodides

Abstract

Second-order Raman scattering in alkali iodides has been studied at 5 K by using a usual deuterium discharge lamp and a single prism monochromator. The remarkable resonance enhancement of the scattering efficiency for 2-LO phonons has been observed in the edge region of the 1s exciton absorption band. From the comparison of the results with existing theory the dominant scattering process in this region is concluded to be successive scattering of the virtually created 1s exciton by two LO phonons.