Local Fields in Liquids

  • Branka M. Ladanyi
Part of the NATO ASI series book series (volume 127)

Abstract

In this article the present state of theory and experiments designed to determine local field effects on light scattering and induced birefringence in liquids of optically anisotropic molecules is reviewed. Attention is focused on the effective polarizabilities, which measure the deviation of local field contributions to the observed intensities from the isotropic Lorenz-Lorentz forms. Results of measurements of effective polarizabilities in isotropic and depolarized light scattering (DLS) from pure liquids and dilute solutions are described. Molecular theory, which explains the observed behavior of effective polarizabilities in terms of the anisotropy of the short range fluid structure and dipole-induced dipole intermolecular interactions, is presented. It is shown how the molecular theory relates the effective polarizabilities observed in DLS, Kerr effect, and Cotton-Mouton effect. The dielectric cavity theory for effective polarizabilities is derived from the molecular theory. The results of this theory along with those of other approximations are compared to the computer simulation results. Theoretical basis and accuracy of two modern experimental methods for measuring effective anisotropic polarizabilities are discussed. Some problems in need of further investigation are briefly described.

Keywords

Anisotropy Benzene Chloroform Toluene Hunt 

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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Branka M. Ladanyi
    • 1
  1. 1.Department of ChemistryColorado State UniversityFort CollinsUSA

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