Abstract
Our recent inelastic X‐ray scattering (IXS) experiments on several non‐simple liquid metals have revealed characteristic common features in the collective dynamics. 1) Clear indications for propagating phonon modes were found as in simple liquid metals as liquid alkalis. 2) They exhibit a positive dispersion of about 20 % (except in liquid Ge) again as in liquid simple metals. 3) A very short time (sub‐picosecond) retaining of the nearest‐neighbor correlation is visualized by a Gaussian component in the quasielastic line shape, which may be related to short living covalent species. In this paper, we review the IXS experiment on liquid Si as a typical non‐simple liquid metal, and discuss its dynamic properties in connection with results of an ab initio molecular dynamics simulation.
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