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We present a closed analytical formula for the scattering intensity fromcharged hard sphere fluids with any arbitrary number of components. Our resultis an extension to ionic systems of Vrij's analogous expression for unchargedhard sphere mixtures. Use is made of Baxter's factor correlation functionswithin the Mean Spherical Approximation (MSA). The polydisperse case of aninfinite number of species with a continuous distribution of hard spherediameters and charges is also considered. As an important by-product of ourinvestigation, we present some properties of a particular kind of matrices (sumof the identity matrix with a dyadic matrix) appearing in the solution of theMSA integral equations for both uncharged and charged hard sphere mixtures.This analysis provides a general framework to deal with a wide class of MSAsolutions having dyadic structure and allows an easy extension of our formulafor the scattering intensity to different potential models. Finally, therelevance of our results for the interpretation of small angle neutronscattering experimental data is briefly discussed.Comment: 37 pg., Revtex 3.0, no figures, to appear in J. Chem Phys. for any  problem: achille@unive.i

journal of chemical physics online/the journal of chemical physics/journal of chemical physics

Scattering functions for multicomponent mixtures of charged hard spheres, including the polydisperse limit: Analytic expressions in the mean spherical approximation