Abstract

The dispersion of the optic axial angle of the (C nH 2n+1NH 3) 2ZnX 4 crystals with 10⩽n⩽14 and X 4Cl 4,Cl 2Br 2 has been investegated between 273 K and 363 K in the spectral interval from 470 nm. to 650 nm. The experimental results show, together with a high anomalous optical dispersion, the axistence of an isotropic point. At this point the optical plane rotates 90 o - around the acute bisectrix. A dependence of the isotropic point temperature with n, X, and the wave length is also found.

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