Abstract
By inelastic neutron scattering the coherent dynamic structure factor S(Q, ω) of liquid cesium has been measured near the melting point at T = 308 K. Using triple axis spectrometers at the ILL Grenoble and the FRM München the scattering law was determined for energy transfers from −1.5 to 10 meV in the low momentum transfer region from 0.2 Å −1 to 2.5 Å −1. A model analysis yields quantities such as the dispersion relation of collective modes up to Q values beyond Q 0, the first maximum of the structure factor S(Q). An anomalous dispersion due to shear relaxation in the liquid is revealed. In the vicinity of Q 0 the measured half width of the coherent central peak of S(Q, ω) confirmes recent theoretical assumptions of a collective diffusion-like structural relaxation process in dense liquids at temperatures near the melting point.
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