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Relationship between microscopic and macroscopic orientational relaxation times in polar liquids

Chandra, Amalendu and Bagchi, Biman (1990) Relationship between microscopic and macroscopic orientational relaxation times in polar liquids. In: Journal of Physical Chemistry, 94 (7). pp. 3152-3156.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100370a074


Microscopic relations between single-particle orientational relaxation time (T, ) , dielectric relaxation time ( T ~ )a,n d many-body orientational relaxation time ( T ~o)f a dipolar liquid are derived. We show that both T~ and T~ are influenced significantly by many-body effects. In the present theory, these many-body effects enter through the anisotropic part of the two-particle direct correlation function of the polar liquid. We use mean-spherical approximation (MSA) for dipolar hard spheres for explicit numerical evaluation of the relaxation times. We find that, although the dipolar correlation function is biexponential, the frequency-dependent dielectric constant is of simple Debye form, with T~ equal to the transverse polarization relaxation time. The microscopic T~ falls in between Debye and Onsager-Glarum expressions at large values of the static dielectric constant.

Item Type: Journal Article
Publication: Journal of Physical Chemistry
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Jan 2011 11:27
Last Modified: 12 Jan 2011 11:27
URI: http://eprints.iisc.ac.in/id/eprint/34963

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