Using split X-ray pulses at the LCLS, nanoscale nanosecond equilibrium structural dynamics were measured in a colloidal liquid, marking the first demonstration of split-and-delay ultrafast hard X-ray photon correlation spectroscopy.
Significance and Impact
This work enables the study of atomic-length-scale dynamics of materials over time scales of femtoseconds to nanoseconds at X-ray laser light sources, filling a critical gap in measuring equilibrium dynamics in complex systems.
- A split-and-delay instrument was used to temporally separate individual LCLS pulses by 1.3 nanoseconds, and two-pulse speckle patterns were measured from a suspension of gold nanoparticles in hexane at different scattering vectors.
- Contrast was extracted from very weak speckle patterns using maximum likelihood fitting, enabling dynamics to be observed.
Work was performed at Argonne and SLAC National Laboratories.
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