Coherent X-rays as a new probe for the investigation of the dynamics of opaque colloidal suspensions

Third generation synchrotron radiation sources open up the possibility of using the coherence properties of the produced X-ray beam. The novel X-ray photon correlation spectroscopy (XPCS) technique probes slow dynamics of disordered material in overcoming the limitations usually occurring using photon correlation spectroscopy with coherent visible light. It is extending the accessible Q-range to short wavelength density fluctuations and is not sensitive to multiple scattering effects; thus allowing the investigation of the dynamics of opaque materials such as magnetic colloidal suspensions.