Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 25, Issue -, Pages 1753-1759Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577518013899
Keywords
USAXS; XPCS; colloid dynamics; coherent X-ray scattering
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Successful implementation of the single-photon-counting Eiger 500k pixel array detector for sub-millisecond X-ray photon correlation spectroscopy (XPCS) measurements in the ultra-small-angle scattering region is reported. The performance is demonstrated by measuring the dynamics of dilute silica colloids in aqueous solvents when the detector is operated at different counter depths, 4, 8 and 12bit. In the fastest mode involving 4bit parallel readout, a stable frame rate of 22kHz is obtained that enabled measurement of intensity-intensity autocorrelation functions with good statistics down to the 50 mu s range for a sample with sufficient scattering power. The high frame rate and spatial resolution together with large number of pixels of the detector facilitate the investigation of sub-millisecond dynamics over a broad length scale by multispeckle XPCS. This is illustrated by an example involving phoretic motion of colloids during the phase separation of the solvent.
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