The role of the pair potential in determining the behaviour of density and wavenumber derivatives of the structure factor of liquid rubidium is assessed. By solving the Percus-Yevick approximation numerically for the Price effective interionic potential and related potentials, the effects of various parts of the interionic interaction can be delineated. The conclusion of this study is that the agreement between the structure factor derivatives and the high accuracy of the Price potential results are the result of the combined effect of the softness of the repulsion and the non-monotonic nature of the tail of the potential.
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Arlinghaus et al. (1987) studied this question.
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