Resonance Raman Scattering in CdS and ZnO by Tunable Dye Laser

Publisher Website
Google Scholar
Abstract
Second-order Raman effect has been investigated in CdS and ZnO at liquid He temperature by using a tunable exciting light source. An organic dye laser has been employed which is pumped by a nitrogen laser and produces continuously wavelength-variable light pulses of ∼10 kW peak power. Measured frequency dependence of the scattering cross-section near the resonance region is compared with existing theory. The result indicates that the dominant scattering mechanism in this region is successive scattering of the virtually created A exciton by two longitudinal optical phonons. With high density excitation (∼0.6 MW/cm 2 ), the intensity ratio of the Raman line to the incident laser light has been found to decrease remarkably under the nearly resonant condition in CdS. This effect is attributed to the light absorption induced by intense electronic excitation of the material.

This publication has 26 references indexed in Scilit: