Role of the surface electronic response function on treatments of the liquid-vapor interface of alkali metals

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Abstract
We present a treatment of the surface of liquid alkali metals based on a perturbative expansion to second order in the electron-ion pseudopotential. We make a simple direct approximation for the inhomogeneous electronic response function, in contrast to previous work which approximates the effective pair interaction. It is found that the surface tension, obtained by using a nonmonotonic parametrization of the ionic profile, is in good agreement with the experimental value and improves the results of the previous approaches.