Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 4: Thin film analysis II

DS 4.6: Vortrag

Montag, 27. März 2006, 12:30–12:45, GER 38

Coherence experiments with white synchrotron radiation — •Gudrun Gleber, Tobias Panzner, and Ullrich Pietsch — Universität Siegen, Siegen, Germany

3rd generation storage rings provide partly coherent radiation allowing a new kind of x-ray experiments, so called x-ray photon correlation spectroscopy (XPSC) experiments. XPSC experiments gives access to static or dynamic properties of a sample on a nanometer length scale.

Usually XPCS-experiments are performed by use of monochromatic radiation. To record the whole reciprocal space information by this way, one has to change stepwise the angle of incidence, which also will change the illuminated sample area and subsequently the diffraction pattern. Using a polychromatic beam provided at the energy dispersive reflectometry beamline (EDR-beamline) at the BESSY II and an energy dispersive detector, we are able to measure the same information without changing the incident angle which keeps the illuminated sample area constant. This is a big advantage for the surface reconstruction from the measured diffraction pattern. Due to the fact, that one energy spectrum gives access to different regions of the sample we are using this technique to observe slow processes in polymers.

In this talk we will report on the present status of the static and dynamic measurements in an energy dispersive regime.