Optical Polarization in Molecular Dielectric Fluids

Chapter

Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 35)

Abstract

The characteristics of optical polarization and light scattering in molecular fluids differ from those of simple atomic fluids in several ways:

(1)

The shape of the molecules (if they are not nearly spherical) is extremely important in forming short-range correlations between orientations and positions and among orientations, or even long-range orientational order (as in liquid crystals).
(2)

The complexity of Raman line spectra (owing to electronic and vibrational energy-level structure, and also to rotational structure in gases and in “quantum” liquids) introduces the problem of dealing with the variation of the scattering amplitudes and the correlation functions with the internal quantum numbers. An illustration to the complexity of these effects is presented here by D. Frenkel [1].
(3)

The richness of intermolecular-force effects in collision-induced light scattering, compared to the simple dipole-dipole interaction of the Stephen approach to atomic fluids [2]. All kinds of higher-multipole and short-range forces contribute to collision-induced scattering, causing a variety of phenomena such as inducing symmetry-forbidden Raman transitions.

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