Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 11: Glasses II (with CPP, talks by DY)
DY 11.2: Vortrag
Dienstag, 27. März 2012, 10:15–10:30, MA 004
Glassy dynamics on the atomic scale measured with XPCS — •Manuel Ross1, Michael Leitner1,2, Markus Stana1, and Bogdan Sepiol1 — 1Department of Physics, University of Vienna, 1090 Vienna, Austria — 2Physics Department E13, Technical University of Munich, 85747 Garching, Germany
The world of solids can be divided into crystals and amorphous materials. One of physics' unsettled questions is the dynamic behavior of these amorphous materials, especially that of glasses. In our group, we developed a new method for observing dynamics on the atomic level [1]. Utilizing the most brilliant X-rays generated by high energy synchrotron sources and measuring in the diffuse regime of scattering, the principle of photon correlation spectroscopy can be extended to the sub-nanometer range. We currently apply our method to glasses in order to shed light on the processes which govern glassy dynamics. In particular, we study lead and silicate glasses, where the network is built of tetrahedral structures. I will present our recent results obtained from measurements at ESRF and PETRA III and the consequences for our view on the atomic dynamics of glasses.
[1] M. Leitner, B. Sepiol, L. M. Stadler, B. Pfau, and G. Vogl, Atomic diffusion studied with coherent X-rays, Nature Mat. 8, 717 (2009).