The behavior of the inter-ionic potential of condensed liquid cesium in a wide temperature range

The electronic structure of the liquid alkali metals depends strongly on their thermodynamic state. Here a modified pseudo-potential model has been applied to investigate the behavior of the inter-ionic potential of condensed liquid cesium from its melting point to the metal non-metal transition region. The parameters of the potential model are obtained from the experimental thermophysical data with a simple statistical mechanical model and some thermodynamic arguments. In low temperatures, the resulted inter-ionic potentials have a good behavior in the short range and contain the characteristic long range oscillations quite well. By increasing the temperature, the long range oscillations begin to disappear gradually. This behavior might be attributed to the change in the nature of inter-atomic interactions as a result of the localization of the valence electrons.