Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Poster session
MM 23.36: Poster
Dienstag, 26. Februar 2008, 14:45–18:00, Poster B
Anomalous small-angle x-ray scattering beamline B1 at HASYLAB, DESY — •Ulla Vainio1, Günter Goerigk2, and Rainer Gehrke1 — 1HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg, Germany — 2Institut für Festkörperforschung, Forschungszentrum Jülich, Postfach 1913, D-52425 Jülich, Germany
Anomalous small-angle x-ray scattering (ASAXS) is a contrast variation technique used for studying the structure of complex materials which have coexisting inhomogeneities of different chemical composition. By measuring at different photon energies near an absorption edge of a certain chemical element contained in the sample, the small-angle scattering caused by the distribution of that element can be distinguished from other scattering contributions caused by other elements or by voids in the case of porosity. This is possible because the scattering factor of the considered element changes significantly near its absorption edge.
The dedicated instrument is optimized for this kind of measurement in terms of precision. The energy of the radiation can be tuned from 5 keV up to 35 keV and accurate x-ray absorption scans can be performed.
The beamline is located at a bending magnet at the DORIS storage ring. It was originally built by research centre Jülich in the 1980s and was upgraded in collaboration with HASYLAB in 2006 (G. Goerigk (2006) HASYLAB annual report, pp. 77 - 78) . Since July 2007 the beamline is operated by HASYLAB.