A novel event correlation scheme for X-ray photon correlation spectroscopy

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.

[1]  Laurence Lurio,et al.  Area detector based photon correlation in the regime of short data batches: Data reduction for dynamic x-ray scattering , 2000 .

[2]  Vincent Dupuis,et al.  Glassy dynamics and aging in a dense ferrofluid , 2006 .

[3]  Y. Chushkin,et al.  A small-angle scattering chamber for x-ray photon correlation spectroscopy at low temperatures. , 2011, The Review of scientific instruments.

[4]  L. Cipelletti,et al.  Dynamics of a colloid-stabilized cream. , 2008, Physical review. E, Statistical, nonlinear, and soft matter physics.

[5]  Mark Sutton,et al.  Using coherence to measure two-time correlation functions. , 2003, Optics express.

[6]  Pablo G. Debenedetti,et al.  Supercooled liquids and the glass transition , 2001, Nature.

[7]  A. Madsen,et al.  Evolution of dynamics and structure during formation of a cross-linked polymer gel , 2011 .

[8]  David A. Weitz,et al.  Ultralow-angle dynamic light scattering with a charge coupled device camera based multispeckle, multitau correlator , 1999 .

[9]  Mark Sutton,et al.  X-ray intensity fluctuation spectroscopy studies on phase-ordering systems. , 2005, Physical review letters.

[10]  Yuriy Chushkin,et al.  Dynamics of nanoparticles in a supercooled liquid. , 2008, Physical review letters.

[11]  R. Pecora,et al.  Soft-matter characterization , 2008 .

[12]  C. Gutt,et al.  Slow aging dynamics and avalanches in a gold-cadmium alloy investigated by x-ray photon correlation spectroscopy. , 2011, Physical review letters.

[13]  G. B. Stephenson,et al.  Observation of speckle by diffraction with coherent X-rays , 1991, Nature.

[14]  J. Harden,et al.  Gel formation and aging in weakly attractive nanocolloid suspensions at intermediate concentrations. , 2011, The Journal of chemical physics.

[15]  Andrew Schofield,et al.  Slow dynamics and aging in colloidal gels studied by x-ray photon correlation spectroscopy. , 2007, Physical review. E, Statistical, nonlinear, and soft matter physics.

[16]  D. Mills.  Third-generation hard x-ray synchrotron radiation sources : source properties, optics, and experimental techniques , 2002 .

[17]  Mark Sutton,et al.  Nanoparticle motion within glassy polymer melts. , 2009, Physical review letters.

[18]  Graham Williams,et al.  Non-symmetrical dielectric relaxation behaviour arising from a simple empirical decay function , 1970 .

[19]  R. Perzynski,et al.  Probing heterogeneous dynamics of a repulsive colloidal glass by time resolved x-ray correlation spectroscopy , 2008 .

[20]  L Cipelletti,et al.  Investigation of q-dependent dynamical heterogeneity in a colloidal gel by x-ray photon correlation spectroscopy. , 2007, Physical review. E, Statistical, nonlinear, and soft matter physics.

[21]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.