Abstract
The dynamic structure factor of molten CsCl has been measured at low momentum transfer,1.4 nm−1≤Q<33 nm−1, using high-resolution inelastic x-ray scattering. The longitudinal acoustic mode disperses1.7 times faster than the adiabatic sound velocity and its linewidth increases following theQ2 law as predicted by the hydrodynamics. However, the linewidth is a factor of seven smallerthan the estimation using the linewidths obtained from Brillouin light scattering. The largespeed-up and the significant narrowing of the collective mode, which can be related to eachother by a recently presented viscoelastic theory, must arise from the intrinsic nature ofmolten alkali chlorides. Furthermore in comparison with the previous results for moltenNaCl and KCl, the apparent sound velocity is found to be approximately scaled bythe inverse of the square-root of the effective mass among these molten salts.
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