Large 1LO Raman scattering near resonance in CdS is observed in the diagonal components of the Raman tensor $R^{\alpha \alpha }$ independent of crystal-symmetry selection rules. The data support the interpretation as an intrinsic bulk effect dependent on the finite wavelength of light.

• Received 17 July 1970

DOI:https://doi.org/10.1103/PhysRevLett.26.86