Research Projects: Advanced Scattering Techniques

X-Ray Photon Correlation Spectroscopy (XPCS)

X-ray Photon Correlation Spectroscopy (XPCS) has the potential to measure the relaxation rate of the dynamic structure factor of materials over a wide range of time scales (1ms-1000 s) in and out of thermodynamic equilibrium at wavevectors inaccessible to visible light (0.004-2 A-1). XPCS experiments should expand our understanding of short length scale fluctuations, as well as enabling studies of opaque materials like metal alloys. Most of the results reported to date have been performed on systems with a large length scale microstructure which greatly enhances the scattered intensity due to the coherent addition of the scattering from the large number of atoms in the microstructure. This includes aggregate systems such as colloids and polymer micelles, spinodally decomposing systems, and systems with anti-phase domains. Binary mixtures of small molecular weight fluids have much faster fluctuations (1ms to s), and they typically scatter more weakly than systems studied previously. As such, they represent an important test of the general applicability of XPCS to a wide variety of materials.

Selected Publications:

  • T.Thurn-Albrecht, G.Meier, P.Müller-Buschbaum, A.Patkowski, W.Steffen, G.Grübel, D.L.Abernathy, O.Diat, M.Winter, M.Koch, M.T.Reetz
    Structure and dynamics of surfactant stablized aggregates of palladium nanoparticles under dilute and semidilute conditions: Static and dynamic x-ray scattering;
    Phys.Rev.E 59, 642 (1999)
  • T.Thurn-Albrecht, F.Zontone, G.Grübel, W.Steffen, P.Müller-Buschbaum, A.Patkowski
    Photon correlation spectroscopy with high energy coherent x-rays;
    Phys.Rev.E 68, 031407 (2003)