![](https://d3ilqtpdwi981i.cloudfront.net/vC-2dNTDwUuu5dcOqw61OnzwneU=/425x550/smart/https://bepress-attached-resources.s3.amazonaws.com/uploads/0e/b8/f6/0eb8f6bb-7038-468d-aaea-eea7aaf38de3/thumbnail_44702b9f-5a41-441a-86b5-ebbb883c191f.jpg)
- Dielectrics,
- Dipole moments,
- Polarizability (Electricity),
- Mathematical physics
The existence of the dielectric constant epsilon is investigated for fluids composed of classical deformable (polarizable) molecules. The development is based upon generalized functional-derivative relations which involve joint distributions in molecular positions r/sub k/ and dipole moments ..mu../sub k/. Sufficient conditions for the existence of epsilon are expressed in terms of the generalized direct correlation function c(12) = c(r/sub 1/, ..mu../sub 1/; r/sub 2/, ..mu../sub 2/). It is found that epsilon exists if -kTc(12) depends only on relative positions and dipole moment directions (in addition to Vertical Bar..mu../sub 1/Vertical Bar and Vertical Bar..mu../sub 2/Vertical Bar), and becomes asymptotic to the dipole--dipole potential at long range. An expression for epsilon in terms of a short-ranged total correlation function h/sub 0/(12) emerges automatically from the development. An expression for epsilon in terms of c(12) is also derived. The latter expression involves an inverse kernel in (Vertical Bar..mu../sub 1/Vertical Bar, Vertical Bar..mu../sub 2/Vertical Bar) space. The case of rigid polar molecules is reconsidered as a special case of the present formulation.
This is the publisher's final pdf. Article appears in Journal of Chemical Physics (http://jcp.aps.org/) and is copyrighted by APS Journals (http://publish.aps.org/)
*At the time of publication John Ramshaw was affiliated with University of California, Los Alamos National Laboratory