Resonant dispersion of the Brillouin shift in CdS

Abstract
Resonant dispersion of the Brillouin shift in CdS has been observed with a high-resolution triple-pass Fabry-Perot interferometer. Tuning of the A exciton relative to the 4880-Å argon laser line was accomplished by varying the temperature. Reflectance spectra were also measured at different temperatures, and optical constants deduced from them predict Brillouin shifts which are consistent with those observed.