Memory functions from molecular dynamics simulations of liquid sodium

Molecular dynamics simulation results are used to derive the memory functions for the total intermediate scattering function and for its self part. The memory functions for the current-current correlation functions are also derived. The MD results have earlier been compared with neutron inelastic scattering results and were found to satisfactorily describe a sodium system. The generalized longitudinal kinematic viscosity function as well as the generalized diffusion coefficient are calculated and briefly discussed. (orig.)