Kinetic model for classical liquids

Abstract

The effect on the dynamical structure factor $S\left(k\omega \right)$ due to coupling to temperature fluctuations and to the self-motion is investigated. For this purpose a phenomenological equation for the one-particle phase-space correlation function is presented and is used for explicit calculations. The equation gives for $k\to 0$, $\omega \to 0$ the correct hydrodynamic results and for large values of $k$ it gives correctly the single-particle motion. Detailed comparisons with experimental and molecular-dynamics results are presented for liquid argon and rubidium.