Experimental determination of molecular polarizability anisotropy of nematogens by depolarized Rayleigh light scattering

The anisotropy of molecular polarizability Deltaalpha of several nematogens has been determined by depolarized Rayleigh light scattering. The experimentally determined values were found to be noticeably smaller than those obtained by MOPAC calculation. Deltaalpha values determined from order parameter S and refractive indices show reasonably good agreement with those determined in the present experiment. This result warns us that Deltaalpha calculated by MOPAC, particularly at a finite wavelength, may be larger than the true value.