title: Ionic fluids: charge and density correlations near gas-liquid criticality.
abstract: The correlation functions of an ionic fluid with charge and size asymmetry are studied within the framework of the random phase approximation. The results obtained for the charge-charge correlation function demonstrate that the second-moment Stillinger-Lovett (SL) rule is satisfied away from the gas-liquid critical point (CP) but not, in general, at the CP. However, in the special case of a model without size asymmetry the SL rules are satisfied even at the CP. The expressions for the density-density and charge-density correlation functions valid far from and close to the CP are obtained explicitly.
authors.affiliation: Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 1, Svientsitskii Street 79011 Lviv, Ukraine.
authors.forename: Oksana
authors.initials: O
authors.lastname: Patsahan
authors.forename: Ihor
authors.initials: I
authors.lastname: Mryglod
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Caillol