Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 45, Issue -, Pages 807-813Publisher
WILEY-BLACKWELL
DOI: 10.1107/S0021889812023321
Keywords
X-ray photon correlation spectroscopy; event correlation scheme; speckle patterns; X-ray free-electron lasers
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X-ray photon correlation spectroscopy (XPCS) was employed to measure the time-dependent intermediate scattering function in an organic molecular glass former. Slow translational dynamics were probed in the glassy state and the correlation functions were calculated from two-dimensional speckle patterns recorded by a CCD detector. The image frames were analysed using a droplet algorithm together with an event correlation scheme. This method provides results analogous to standard intensity correlation algorithms but is much faster, hence addressing the recurrent problem of insufficient computing power for online analysis in XPCS. The event correlator has a wide range of potential future applications at synchrotrons and free-electron laser sources.
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