Coherent dynamic scattering law of divalent liquid Mg

The dynamic structure factor S(Q, omega) of liquid (l-) Mg was measured at 700degreesC using high-resolution inelastic X-ray scattering. Based on the high-quality experimental data presented in this paper, we discuss the particle dynamics in dense l-Mg using the generalized hydrodynamic theory for phonon excitations. The particle motion in this liquid is influenced by collective longitudinal modes, similar to other simple liquid metals such as l-alkali metals. The Q dependence of quasielastic line width can be interpreted based on an existing theory modified from the de Gennes formalism.