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Location of the Fisher-Widom line for systems interacting through short-ranged potentials


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dc.creator Vega, Carlos es
dc.creator Rull Fernández, Luis Felipe es
dc.creator Lago, S. es 2018-02-02T17:02:03Z 2018-02-02T17:02:03Z 1995
dc.identifier.issn 1539-3755 (impreso) es
dc.description.abstract For finite-ranged potentials the behavior of the total correlation function h (r) at large distances can be of two different types. In three-dimensional systems at low densities the function r h (r) presents exponential decay whereas at high densities it presents exponentially damped oscillatory decay. The locus of points on the phase diagram where a transition from exponential to oscillatory decay occurs is denoted as the Fisher-Widom line after the work of these authors [M. E. Fisher and B. Widom, J. Chem. Phys. 50, 3756 {1969)]. These authors exactly computed the Fisher-Widom line for several one-dimensional systems and conjectured that the same behavior could occur in three dimensions. In this work the Fisher-VA'dom line is computed for a three-dimensional finite-range potential by using the structural information obtained from the reference hypernetted chain theory which is probably the most successful theory of liquid structure available now. By combining these results with computer simulations of the vapor-liquid equilibria of the considered model the Fisher-Widom line is located within the phase diagram of the model. For the considered model the Fisher-VA'dom line cuts the liquid branch of the vapor liquid equilibria at a reduced temperature of T/T, =0.88 and a reduced density of p/p, =2.07. The effect of the range of the potential on the location of the Fisher-%'idom line is also considered. Increasing the range of the potential reduces the region of the phase diagram where oscillatory behavior of the function r h (r ) occurs. The long-range decay of a Lennard Jones Quid is also considered. Decay of h (r) to zero at large distances is difFerent for a Lennard-Jones potential and for a finite-ranged potential. Although the Lennard Jones potential does not present a true Fisher-Widom line when the ultimate decay of h (r} is considered it is shown that it exhibits a Fisher-Widom —like transition when an intermediate range of distances is considered. es
dc.format application/pdf es
dc.language.iso eng es
dc.publisher Physical Review E es
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 Internacional *
dc.rights.uri *
dc.title Location of the Fisher-Widom line for systems interacting through short-ranged potentials es
dc.type info:eu-repo/semantics/article es
dc.type.version info:eu-repo/semantics/publishedVersion es
dc.rights.accessrights info:eu-repo/semantics/openAccess es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear es
idus.format.extent 10 P. es
dc.journaltitle Physical Review E es
dc.publication.volumen 51 es
dc.publication.issue 4 es
dc.publication.initialPage 1 es
dc.publication.endPage 10 es
dc.identifier.sisius 6607671 es
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