POTENTIAL EFFECTS ON ATOMIC MOTIONS IN LIQUID ALKALI-METALS

Molecular dynamics simulations of liquid sodium and cesium have been c arried out using the Dagens-Rasolt-Taylor (DRT) interatomic potentials . Results for the static pair correlation function and the velocity au tocorrelation function have been obtained and compared with similarly obtained recent data using the Price-Singwi-Tosi (PST) potentials. Bot h potentials are found to provide excellent agreement with experimenta l static pair correlation function. Results for the velocity autocorre lation function do not Seem to be too different in spite of the fact t hat the DRT potentials possess no scaling features as exhibited by the PST potentials. However, the mean square displacement of the particle s are found to reveal more clearly the effects of differences in poten tials.