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O: Fachverband Oberflächenphysik

O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry

O 45.3: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

A compact and calibratable von Hamos X-Ray Spectrometer based on two full-cylinder HAPG mosaic crystals for high-resolution XES — •Ina Holfelder, Rolf Fliegauf, Yves Kayser, Matthias Müller, Malte Wansleben, Jan Weser, and Burkhard Beckhoff — Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin, Germany

For high-resolution X-ray Emission Spectroscopy (XES), crystal-based Wavelength-Dispersive Spectrometers (WDS) can be applied for effective speciation characterization of nano- and microscaled materials. A von Hamos geometry provides the highest detection efficiencies combined with high resolving power. This geometry uses a cylindrically bent crystal as dispersive and as a sagittal focusing optic. Highly Annealed Pyrolytic Graphite (HAPG) can be deposited reliably on cylindrical glass substrates and shows highly integrated reflectivity while offering low mosaicity, ensuring high resolving power. A novel calibratable von Hamos X-ray spectrometer based on two full-cylinder optics is being put into operation at the PTB. The spectrometer enables chemical speciation of elements in an energy range from above 10 keV down to 2.3 keV. The first results using synchrotron radiation as the excitation source will be presented. The spectrometer combines high efficiency with high spectral resolution in a compact arrangement also suitable for laboratory arrangements.