Charge Oscillations in Debye-Hueckel Theory
Benjamin P. Lee, Michael E. Fisher
Abstract
The recent generalized Debye-Hueckel (GDH) theory is applied to the calculation of the charge-charge correlation function GZZ(r). The resulting expression satisfies both (i) the charge neutrality condition and (ii) the Stillinger-Lovett second-moment condition for all T and rhoN, the overall ion density, and (iii) exhibits charge oscillations for densities above a "Kirkwood line" in the (rhoN,T) plane. This corrects the normally assumed DH correlations, and, when combined with the GDH analysis of the density correlations, leaves the GDH theory as the only complete description of ionic correlation functions, as judged by (i)-(iii), (iv) exact low-density (rhoN,T) variation, and (v) reasonable behavior near criticality.
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