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Long-range polarization interaction in simple liquid metals.

In earlier work [F. Perrot and N. H. March, Phys. Rev. A 41, 4521 (1990); 42, 4884 (1990)], the electron theory of pair potentials in simple s-p liquid metals, such as Na and K near freezing, was set out. The potential thus derived for Na is in good agreement in its major features with that obtained by inverting diffraction measurements of the liquid structure factor S(κ). The present study addresses polarization effects in the interatomic interaction in such s-p metals, a simple physical model being introduced. By a lower-bound argument, this is shown to lead to an attractive contribution to the effective pair potential which decays as R -4 at large interionic separation R