Propagating collective excitations in molten salts

Longitudinal as well as transverse dynamics of a molten salt beyond the hydrodynamic region is studied within the generalized collective modes (GCM) approach. An analytical three-variable model is applied to the treatment of the coupled longand short-time charge fluctuations. Dispersion laws of propagating kinetic collective excitations such as optic phonon-like modes, heat and shear waves are obtained and analyzed for the case of molten NaCl within the eight-variable GCM scheme, combining the analytical methods and molecular dynamics simulations.