Abstract
Three-dimensional photon correlation spectroscopy (3D PCS) is a well-known technique developed to suppress multiple scattering contributions in correlation functions, which are inevitably involved when an optical laser is employed to investigate dynamics in a turbid system. Here, we demonstrate a proof-of-principle study of 3D PCS in the hard X-ray regime. We employ an X-ray optical cross-correlator to measure the dynamics of silica colloidal nanoparticles dispersed in polypropylene glycol. The obtained cross correlation functions show very good agreement with auto-correlation measurements. This demonstration provides the foundation for X-ray speckle-based studies of very densely packed soft matter systems.
Highlights
Investigations of the structural and dynamic properties of a sample system based on speckle correlation techniques have played a key role in understanding various complex systems in condensed matter physics, such as colloids [1,2,3,4], polymers [5,6], capillary waves [7], metallic glasses [8,9], molecular glasses [10], and water [11,12,13]
Scattered photons are capable of affecting the speckle patterns, owing to their path length differences [17], and might give rise to an inaccuracy in the obtained sample dynamics from photon correlation spectroscopy (PCS) [18,19,20]
By correlating a time series of speckle intensities generated by a coherent light source, the correlation function decays as a function of delay time, with a relaxation rate governed by the sample dynamics
Summary
Investigations of the structural and dynamic properties of a sample system based on speckle correlation techniques have played a key role in understanding various complex systems in condensed matter physics, such as colloids [1,2,3,4], polymers [5,6], capillary waves [7], metallic glasses [8,9], molecular glasses [10], and water [11,12,13]. Three-dimensional photon correlation spectroscopy (3D PCS) is a well-known technique developed to suppress multiple scattering contributions in correlation functions, which are inevitably involved when an optical laser is employed to investigate dynamics in a turbid system. We employ an X-ray optical cross-correlator to measure the dynamics of silica colloidal nanoparticles dispersed in polypropylene glycol.
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