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Intermediate Scattering Functions (ISF's) are measured for colloidal hardsphere systems using both Dynamic Light Scattering (DLS) and X-ray PhotonCorrelation Spectroscopy (XPCS). We compare the techniques, and discuss theadvantages and disadvantages of each. Both techniques agree in the overlappingrange of scattering vectors. We investigate the scaling behaviour found bySegre and Pusey [1] but challenged by Lurio et al. [2]. We observe a scalingbehaviour over several decades in time but not in the long time regime.Moreover, we do not observe long time diffusive regimes at scattering vectorsaway from the peak of the structure factor and so question the existence of along time diffusion coefficients at these scattering vectors.

journal of chemical physics online/the journal of chemical physics/journal of chemical physics

Dynamics of hard-sphere suspension using Dynamic Light Scattering and  X-Ray Photon Correlation Spectroscopy: dynamics and scaling of the  Intermediate Scattering Function