We have used an intense coherent x-ray beam and a real time digital autocorrelator to study the low frequency dynamics of colloidal palladium in glycerol by x-ray photon correlation spectroscopy (XPCS). The translational diffusion was studied in the q range from 1.5×10^-3 to 6×10^-3^-1 and in the temperature range from $279$ to 293K. The measured relaxation rates were proportional to q² and inversely proportional to viscosity as expected for a translational diffusion process. This experiment shows that XPCS can be performed in a wide time range ( 10^-4 to 100s) and opens up a new opportunity for the study of the dynamics of nontransparent media.
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Thurn‐Albrecht et al. (1996) studied this question.
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