A simple equation was derived for obtaining the effective ionic charges of uniaxial crystals on the basis of a rigid ion model by using the optically active lattice vibration frequencies of the TO and LO modes. It was applied to several uniaxial crystals such as wurtzite type (ZnO, ZnS, CdS, and BeO) and rutile type (ZnF2, TiO2, SnO2, and GeO2) crystals. Lattice vibration frequencies of orthorhombic hydrogen chloride crystal were calculated by means of a point charge model to estimate the effect of the long range Coulomb interaction on the vibrational frequencies of molecular crystals.
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Jiro Hiraishi (1973) studied this question.
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