Lattice Vibrational Properties of Hexagonal CdSe

Abstract

The reflectivity of single‐crystalline CdSe was studied with linearly polarized light at room temperature and at liquid‐nitrogen temperature. The characteristic data of the fundamental lattice vibration were determined by means of a classical oscillator fit. A shift of 6 cm−1 or 3.5% in the infrared eigenfrequency was found, due to anisotropy splitting. Transmission measurements yielded several multiphonon peaks and an impurity band. The multiphonon peaks are interpreted in terms of a set of four representative phonon energies for the edge of the Brillouin zone.