Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 24: Poster presentation

DS 24.36: Poster

Dienstag, 28. März 2006, 15:00–17:30, P2

Coherent X-Ray Reflectivity at the Energy Dispersive EDR-Beamline at BESSY II — •Tobias Panzner¹, Gudrun Gleber¹, Tushar Sant¹, Ivan Vartanyants², and Ullrich Pietsch¹ — ¹Universität Siegen, Fachbereich 7, Festkörperphysik, Emmy-Noether-Campus, Walter-Flex-Str. 3, 57068 Siegen — ²DESY Hamburg

3rd generation storage rings provides partly coherent radiation allowing for new kind of x-ray experiments. Adapting knowledge and techniques from the photon correlation spectroscopy with visible light (PCS) many successful experiments are published where sample became under investigation which are opaque in PCS. The advantage of coherent x-ray experiments is the reconstruction of surfaces on micrometer to nanometer length scale (static speckle experiments) or the observation of dynamic processes (XPCS) at surfaces and interfaces on the same length scale. One major drawback of standard x-ray experiments is that only intensities can be measured. In case of coherent x-ray scattering this problem can be overcome by reconstruction of the missing phase information by the so-called phase retrieval procedure. In our poster we show this procedure for energy-dispersive coherent scattering where the development of phase is considered along the whole beam passage from the incoming pinhole through the scattering by sample up to the detector. Taking the known phase information of the pinhole into account we are able to reconstruct the true surface of the illuminated sample area more precisely.