Surface tensions of heavy alkali metals in a wide liquid range of temperature using pair correlation function
This paper presents the prediction of surface tensions of liquid cesium and rubidium metals. The surface tensions prediction was made possible by applying pair potential function, namely LJ (8.5–4). The characterized LJ (8.5–4)-potential function was used to construct the pair correlation function of both liquid alkali metals on the surface, where the approximation of equality of direct correlation with pair correlation function in liquid vapor interface was applied for both cesium and rubidium. Using the Lekner et. al. method, the surface tensions of cesium and rubidium, were predicted successfully in a wide range of thermodynamic states. Results were in good agreement with those determined experimentally within an error of 2.9% and an absolute average deviation of 1.9% for cesium; and within an error of 4.7% and an absolute average deviation of 3.0% for rubidium.
Keywords: Surface tensions, surface thicknesses, pair potential function, pair correlation function, alkali metals.