title: Free-energy functional of the Debye-Hückel model of simple fluids.
abstract: The Debye-Hückel approximation to the free energy of a simple fluid is written as a functional of the pair correlation function. This functional can be seen as the Debye-Hückel equivalent to the functional derived in the hypernetted chain framework by Morita and Hiroike, as well as by Lado. It allows one to obtain the Debye-Hückel integral equation through a minimization with respect to the pair correlation function, leads to the correct form of the internal energy, and fulfills the virial theorem.
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: R
authors.initials: R
authors.lastname: Piron
authors.affiliation: Laboratoire "Interactions, Dynamiques et Lasers", UMR 9222, CEA-CNRS-Université Paris-Saclay, Centre d'Études de Saclay, F-91191 Gif-sur-Yvette Cedex, France.
authors.forename: T
authors.initials: T
authors.lastname: Blenski