Abstract
X-ray photon correlation spectroscopy (XPCS) is a routine technique to study slow dynamics in complex systems at storage-ring sources. Achieving nanosecond time resolution with the conventional XPCS technique is, however, still an experimentally challenging task requiring fast detectors and sufficient photon flux. Here, the result of a nanosecond XPCS study of fast colloidal dynamics is shown by employing an adaptive gain integrating pixel detector (AGIPD) operated at frame rates of the intrinsic pulse structure of the storage ring. Correlation functions from single-pulse speckle patterns with the shortest correlation time of 192 ns have been calculated. These studies provide an important step towards routine fast XPCS studies at storage rings.
Highlights
The result of a nanosecond X-ray photon correlation spectroscopy (XPCS) study of fast colloidal dynamics is shown by employing an adaptive gain integrating pixel detector (AGIPD) operated at frame rates of the intrinsic pulse structure of the storage ring
We have used the pulse nature of a synchrotron to demonstrate nanosecond X-ray photon correlation spectroscopy with 192 ns resolution using AGIPD
Correlation functions obtained from speckle patterns of freely diffusing silica particles in water show the expected microsecond dynamics in the investigated Q range (0.015–0.112 nmÀ1)
Summary
X-ray photon correlation spectroscopy (XPCS) is a very powerful and well established tool to investigate slow dynamics of various complex disordered systems in condensed matter, such as colloids (Dierker et al, 1995; Grubel & Zontone, 2004; Li et al, 2014), polymers (Lehmkuhler et al, 2018; Frenzel et al, 2019), capillary waves (Gutt et al, 2003), metallic glasses (Ruta et al, 2012; Evenson et al, 2015), molecular glasses (Chushkin et al, 2012), charge-density waves (Shpyrko et al, 2007) and water (Perakis et al, 2017, 2018). During recent years the access to faster dynamics has been enabled by hard X-ray free-electron laser sources (XFELs) (Emma et al, 2010; Ishikawa et al, 2012; Kang et al, 2017; Decking et al, 2020) via split-pulse XPCS (Roseker et al, 2018, 2020) and X-ray speckle visibility spectroscopy (XSVS) (Perakis et al, 2018). In both techniques, the time resolution is independent of the detector frame rate. Our result shows the expected dynamics of the investigated system and demonstrates the successful application of AGIPD at storagering sources
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