Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Atomic Physics, Molecular Physics, and Quantum Optics with X-ray FELs (joint session MO/A)

A 30.6: Vortrag

Donnerstag, 14. März 2019, 11:45–12:00, S HS 002 Biologie

X-ray emission spectroscopy using dispersive spectrometers at Synchrotron and X-ray FEL facilities — •Florian Otte^1,2, Christian Bressler², and Metin Tolan¹ — ¹Technische Universität Dortmund, Emil-Figge-Straße 50, 44227 Dortmund, Deutschland — ²European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Deutschland

Crystal spectrometers which enable the energy dispersive detection of X-ray fluorescence during irradiation with intense X-rays have found widespread distribution among X-ray facilities worldwide. Different designs and types exist, but all of them appeal through their ability to track electronic and magnetic properties of samples via characteristic features in X-ray emission signals during the experiment. Which electronic and magnetic properties are accessible specifically, is case and spectrometer dependent. We report on the use of an energy-dispersive von Hamos type spectrometer, which is being used at the FXE instrument at European XFEL GmbH on a regular basis in combination with additional complimentary experimental techniques such as X-ray diffraction for detection of K-edge emission lines on transition metal complexes. A smaller and highly mobile version of this spectrometer type has been successfully used at different beamlines (e.g. P01 at Petra III in Hamburg, Bl9 at DELTA in Dortmund). The highly flexible nature of this spectrometer type is rationalized with experimental results on transition metal complexes. Advantages and disadvantages in comparison with other available spectrometer types are discussed, with special consideration of applications at modern FELs.