Dziarzhytski, S.; Biednov, M.; Dicke, B.; Wang, A.; Miedema, P.S.; Engel, R.Y.; Schunck, J.O.; Redlin, H.; Weigelt, H.; Siewert, F.; Behrens, C.; Sinha, M.; Schulte, A.; Grimm-Lebsanft, B.; Chiuzbaian, S. G.; Wurth, W.; Beye, M.; Rübhausen, M.; Brenner, G.: The TRIXS end-station for femtosecond timeresolved resonant inelastic x-ray scattering experiments at the soft x-ray free-electron laser FLASH. Structural Dynamics 7 (2020), p. 054301/1-12
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We present the experimental end-station TRIXS dedicated to time-resolved soft x-ray resonant inelastic x-ray scattering (RIXS) experiments on solid samples at the free-electron laser FLASH. Using monochromatized ultrashort femtosecond XUV/soft x-ray photon pulses in combination with a synchronized optical laser in a pump-probe scheme, the TRIXS setup allows measuring sub-picosecond time-resolved highresolution RIXS spectra in the energy range from 35 eV to 210 eV, thus spanning the M-edge (M1 and M2,3) absorption resonances of 3d transition metals and N4,5-edges of rare earth elements. A Kirkpatrick–Baez refocusing mirror system at the first branch of the plane grating monochromator beamline (PG1) provides a focus of (6 6) lm2 (FWHM) at the sample. The RIXS spectrometer reaches an energy resolution of 35–160 meV over the entire spectral range. The optical laser system based on a chirped pulse optical parametric amplifier provides approximately 100 fs (FWHM) long photon pulses at the fundamental wavelength of 800 nm and a fluence of 120 mJ/cm2 at a sample for optical pump-XUV probe measurements. Furthermore, optical frequency conversion enables experiments at 400 nm or 267 nm with a fluence of 80 and 30 mJ/cm2, respectively. Some of the first (pump-probe) RIXS spectra measured with this setup are shown. The measured time resolution for time-resolved RIXS measurements has been characterized as 287 fs (FWHM) for the used energy resolution.