Dynamic structure of expanded liquid rubidium from a molecular-dynamics simulation

The dynamic structures of expanded liquid rubidium from the triple point to near the critical point are investigated by means of a molecular-dynamics simulation with the effective pair potential obtained from the experimental structure factor by the inverse method. The results are discussed in compa rison with the experimental data and also with those obtained with the effe ctive pair potential derived by means of the pseudopotential perturbation t heory. It is shown that the effective pair potential obtained from the stat ic structure factor can reproduce fairly well the dynamic structure factor for a wide range of density up to near the critical point.