Collective motions in classical liquids. II

Pathak, K. N. ; Singwi, K. S. (1970) Collective motions in classical liquids. II Physical Review A, 2 (6). pp. 2427-2434. ISSN 1050-2947

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Official URL: http://pra.aps.org/abstract/PRA/v2/i6/p2427_1

Related URL: http://dx.doi.org/10.1103/PhysRevA.2.2427

Abstract

An improved version of the theory of Singwi et al. for the collective motions in classical liquids is described. The theory is based on a generalized mean-field approximation involving the polarization potential and the screened response function. The latter, instead of having a free-particle form or that corresponding to the true self-motion of the particle in a liquid, is assumed to be a sum of Gaussian functions weighted by the momentum distribution of the particles. The zero and fourth moments of the scattering law determine the polarization potential and the width of the Gaussians. Numerical calculations have been made for the spectral function of the longitudinal current correlations, quasielastic scattering, and absolute intensities for liquid argon in the range of momentum transfer 0.5-6.3 Å−1. The results are in excellent agreement with the molecular-dynamics calculations and recent experiments on a purely coherent sample of liquid argon.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:55996
Deposited On:22 Aug 2011 12:51
Last Modified:22 Aug 2011 12:51

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