The long wavelength limit of the liquid structure factor-a theory for the compressibility of liquid rare gases and metals

W. Schirmacher, Robert Evans*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

68 Citations (Scopus)

Abstract

A theory for the isothermal compressibility of monatomic liquids at temperatures close to their triple points is presented. Assuming that the atoms interact through pairwise potentials, an exact relation for the direct correlation function of the fluid in terms of that of a reference fluid is derived. This is used to construct approximations for the long wavelength behaviour of the liquid structure factor a(q). By dividing the pairwise potential into a reference part, representing the short range repulsive forces, and a perturbation part, representing the long range 'attraction', the compressibility can be expressed in a mean field fashion in terms of an effective hard sphere contribution modified by the perturbation potential. The theory has been used to calculate the long wavelength limit a(q=0) in liquid Ne, Ar, Kr and CH 4 and in a wide range of liquid metals.

Original languageEnglish
Article number007
Pages (from-to)2437-2451
Number of pages15
JournalJournal of Physics C (Solid State Physics)
Volume11
Issue number12
DOIs
Publication statusPublished - 1978

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