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- W2022761598 abstract "We present results for the dynamic structure factor of liquid Ge at 980 ifmmode^circelsetextdegreefi{}C obtained from inelastic x-ray scattering. Spectra were measured for momentum transfers Q from 2 to 28 ${mathrm{nm}}^{mathrm{ensuremath{-}}1}$. Distinct excitations resulting from propagating modes can be identified. The phonon dispersion obtained in the present experiment matches the hydrodynamic sound velocity in the low Q range, i.e., no positive dispersion can be detected. This result is, however, inconsistent with generalized hydrodynamics beyond $Q=5{mathrm{nm}}^{mathrm{ensuremath{-}}1}.$ The energy position of phonon excitations at the quasi-Brillouin zone boundary is consistent with recent findings from ab initio molecular dynamics simulations. The Q dependence of the quasielastic linewidth shows a large difference between the maximum and shoulder positions in $S(Q),$ which cannot be quantitatively explained within the context of a simple hard-sphere picture. However, it can be discussed from the viewpoint of a cluster model proposing transient covalent structures in liquid Ge." @default.
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- W2022761598 date "2001-03-13" @default.
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- W2022761598 title "Inelastic x-ray scattering study on the dynamics of liquid Ge" @default.
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- W2022761598 doi "https://doi.org/10.1103/physrevb.63.134205" @default.
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