Abstract
The collective dynamics of a simple metal (lithium) have been numerically investigated by molecular dynamics and normal mode analysis. A generalized hydrodynamic framework allowed us to describe the system in different thermodynamic phases by the same model based on two relaxation processes. At the melting point we find good agreement with recent inelastic X-ray scattering results, while below the melting point, and ultimately in the glassy state, we find evidences of a “harmonie” relaxation as recently found in Lennard-Jones systems.