Abstract
Abstract Dynamic structure factors S(Q,ω) of liquid Sn were measured at 320 and 1000 °C in the Q range from 2 to ∼30 nm−1 using inelastic X-ray scattering (IXS). The obtained spectra clearly demonstrate the existence of longitudinal propagating modes. A positive dispersion is found in the low Q region, where the mode velocity is about 12% and 6% larger than the hydrodynamic speed of sound at 320 and 1000 °C, respectively. The quasielastic lineshape contains a Gaussian contribution near the Q position of the first maximum in S(Q), which has not yet been reported in simple liquid metals like liquid alkalis. With increasing temperature, the Gaussian contribution increases and can be observed in a wider Q range. The quasielastic lineshape is discussed by connecting with the formation of instantaneous clusters in the melt.
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