Journal Article

PUBDB-2025-00153

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Heisenberg-RIXS instrument at the European XFEL

Schlappa, J. (Corresponding author)XFEL.EU* ; Ghiringhelli, G. (Corresponding author)Extern*XFEL.EU* ; Van Kuiken, B. E. ; Teichmann, M. ; Miedema, P. S. ; Delitz, J. T. ; Gerasimova, N. ; Molodtsov, S. ; Adriano, L.XFEL.EU* ; Baranasic, B. ; Broers, C. ; Carley, R. ; Gessler, P. ; Ghodrati, N. ; Hickin, D. ; Hoang, L. P. ; Izquierdo, M. ; Mercadier, L. ; Mercurio, G. ; Parchenko, S. ; Stupar, M. ; Yin, Z.Extern*XFEL.EU*DESY* ; Martinelli, L. ; Merzoni, G. ; Peng, Y. Y. ; Reuss, T.XFEL.EU*DESY* ; Sreekantan Nair Lalithambika, S.Extern*DESY* ; Techert, S.XFEL.EU*DESY* ; Laarmann, T.XFEL.EU*DESY* ; Huotari, S. ; Schroeter, C. ; Langer, B. ; Giessel, T. ; Buchheim, J. ; Gwalt, G. ; Sokolov, A. ; Siewert, F. ; Buechner, R. ; Vaz da Cruz, V. ; Eckert, S. ; Liu, C.-Y. ; Sohrt, C. ; Weniger, C. ; Pietzsch, A. ; Neppl, S. ; Senf, F. ; Scherz, A. ; Föhlisch, A.

2025
IUCr Chester

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Please use a persistent id in citations: doi:10.1107/S1600577524010890  doi:10.3204/PUBDB-2025-00153

Abstract: Resonant inelastic X-ray scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broadening. Also, in pump–probe experiments the interaction time is made very short by the same core-hole lifetime. RIXS is very photon hungry so it takes great advantage from high-repetition-rate pulsed X-ray sources like the European XFEL. The Heisenberg RIXS instrument is designed for RIXS experiments in the soft X-ray range with energy resolution approaching the Fourier and the Heisenberg limits. It is based on a spherical grating with variable line spacing and a position-sensitive 2D detector. Initially, two gratings were installed to adequately cover the whole photon energy range. With optimized spot size on the sample and small pixel detector the energy resolution can be better than 40 meV (90 meV) at any photon energy below 1000 eV with the high-resolution (high-transmission) grating. At the SCS instrument of the European XFEL the spectrometer can be easily positioned thanks to air pads on a high-quality floor, allowing the scattering angle to be continuously adjusted over the 65–145° range. It can be coupled to two different sample interaction chambers, one for liquid jets and one for solids, each state-of-the-art equipped and compatible for optical laser pumping in collinear geometry. The measured performances, in terms of energy resolution and count rate on the detector, closely match design expectations. The Heisenberg RIXS instrument has been open to public users since the summer of 2022.

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Contributing Institute(s):

1. Strukturdynamik Chemischer Systeme (FS-SCS)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. SFB 1073 C02 - In-situ hochauflösende Untersuchung des aktiven Zustands bei der (photo-) elektrochemischen Wasserspaltung (C02) (240172646) (240172646)
3. EDAX - Beating Complexity through Selectivity:Excited state Dynamics from Anti-Stokes and non-linear resonant inelastic X-ray scattering (669531) (669531)

Experiment(s):

1. Facility (machine) XFEL

Appears in the scientific report 2025

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