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First-order Raman scattering from BeO, ZnO, ZnS, and CdS, all having the wurtzite structure (C₆ₕ), has been investigated. A discussion of the effects of the competition between the long-range electrostatic forces and the short-range forces due to anisotropy in the interatomic force constants on the vibrational spectrum has been included. A series of scattering diagrams are presented showing the geometrical arrangements necessary to observe all the k=0 phonons for this type of crystal structure. In BeO the E₂ mode was resolved from the transverse modes for the first time. The assignments of the E₂ modes in ZnS differ from previous investigations. From absolute intensity measurements, electro-optic coefficients for BeO, ZnO, and CdS were determined.
Argüello et al. (Thu,) studied this question.