Coherence seminar: Soft matter Dynamics Studied With Homeopathic Speckle Patterns
Mario Reisera,b, Jörg Hallmanna, Johannes Möllera, Luigi Cristofolinic, Davide Orsic,
Hendrik Rahmannb, Anna-Lena Beckerb, Christian Guttb, Anders Madsena
aEuropean XFEL, bUniversity of Siegen, cUniversity of Parma
With the advent of highly brilliant X-ray sources coherent scattering techniques like XPCS became a powerful tool for studying dynamics in a variety of systems on the nanometer and atomic length scale. For a long time, the dynamical properties of organic and biological samples (micelles, proteins, etc.) have been hardly accessible by these techniques due to their extensive suffering from beam damage. X-Ray Speckle Visibility Spectroscopy (XSVS) allows for performing measurements in the regime of ‘homeopathically' low intensities by evaluating the photon statistics of single acquisitions. Thereby, it is not only possible to conduct experiments with low radiation doses but also to measure time scales faster than the detector repetition rate, which makes XSVS particularly interesting for future studies of ultrafast dynamics at FELs.
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