The spectral shifts measured in different solvents are expressed as functions of the solvent macroscopic parameters. The value of the correlation coefficient multiplying the functions of electric permittivity was determined by statistical means. The correlation coefficient depends on the electric dipole moment of the spectrally active molecules. The electro-optical parameters in the ground state of the solute molecules can be approximated by molecular modeling. The excited state parameters are usually estimated using the results obtained both by HyperChem Programme and solvatochromic study. The importance of this approximate method is that it offers information about of the excited state of solute molecule for which our measuring possibilities are very restrictive. The information about the excited electronic state is affected by the limits in which the theories of liquid solutions are developed. Our results refer to two molecules of vitamins from B class, namely B3 and B6.
When light propagates parallel to a main direction different from the optical axis, the main refractive indices
corresponding to the ordinary and extraordinary radiations are determined with a Rayleigh interferometer from the phase
difference between the radiation crossing the anisotropic layer (placed in the measure beam) and one isotropic layer
(placed in the comparison beam). The two main indices are measured by using linearly polarized light with electric field
intensity successively oriented parallel and perpendicular to the optical axis of the anisotropic layer. For incidence angles
different from zero two refractive indices are measured: the refractive index for the ordinary radiation and that for the
effective radiation. The effective value of the refractive index was determined from the equation of the refractive indices
surfaces. Quartz from Maramures area and liquid crystalline layer were used as uniaxial samples. The birefringence of
the liquid crystalline layer was modified by varying the intensity of the external electrostatic field. An increase of the
birefringence was evidenced when the intensity of the electrostatic field increased.
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