Abstract
The electric field alignment of substitutional CN - molecules in KCl crystals was studied by measurements of the field-induced optical birefringence (Kerr-effect). The electric field, temperature, wavelength and concentration dependence of the Kerr-effect and its pronounced anisotropy is found in quantitative agreement with a paraelectric alignment model for 〈111〉 oriented CN - molecules, which have electronic absorption transitions hidden under the fundamental crystal absorption, and are characterized by an anisotropic polarizability of α ‖ − α ⊥ = 1.60 A ̊ 3 .
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