Abstract
Liquid alkali metals are treated as a system of charged hard spheres (CHS) in the background of interacting electrons. Such a system of CHS in a uniform background of electrons has been solved exactly by Palmer and Weeks in a mean spherical approximation. With the use of this model as a reference, the effect of responding electrons is taken into account in a linear-response approximation. The resulting expression for the structure factor involves the CHS diameter as the only free parameter and is very simple to compute. It reduces to the familiar Ashcroft-Lekner model when the charge on the hard spheres is taken to be zero. The results obtained for the static structure factor of all the alkali metals at different temperatures are in excellent agreement with the experimental data.
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