Microscopic expression for frequency and wave vector dependent dielectric constant of a dipolar liquid

Chandra, Amalendu and Bagchi, Biman (1989) Microscopic expression for frequency and wave vector dependent dielectric constant of a dipolar liquid. In: Journal of Chemical Physics, The, 90 (3). 1832 -1840.

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Abstract

A microscopic expression for the frequency and wave vector dependent dielectric constant of a dense dipolar liquid is derived starting from the linear response theory. The new expression properly takes into account the effects of the translational modes in the polarization relaxation. The longitudinal and the transverse components of the dielectric constant show vastly different behavior at the intermediate values of the wave vector k. We find that the microscopic structure of the dense liquid plays an important role at intermediate wave vectors. The continuum model description of the dielectric constant, although appropriate at very small values of wave vector, breaks down completely at the intermediate values of k. Numerical results for the longitudinal and the transverse dielectric constants are obtained by using the direct correlation function from the mean‐spherical approximation for dipolar hard spheres. We show that our results are consistent with all the limiting expressions known for the dielectric function of matter.

Item Type:	Journal Article
Publication:	Journal of Chemical Physics, The
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	19 Oct 2010 09:16
Last Modified:	19 Oct 2010 09:16
URI:	http://eprints.iisc.ac.in/id/eprint/33225

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