American Physical Society, Physical Review Letters, 27(77), p. 5437-5440, 1996
DOI: 10.1103/physrevlett.77.5437
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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 Å-1 and in the temperature range from 279 to 293 K. 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 100 s) and opens up a new opportunity for the study of the dynamics of nontransparent media.