Journal Article

PUBDB-2020-03171

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The TRIXS end-station for femtosecond time-resolved resonant inelastic X-ray free-electron laser FLASH

Dziarzhytski, S. (Corresponding author)DESY* ; Biednov, M.CFEL*XFEL.EU* ; Dicke, B.CFEL*Extern* ; Wang, A. ; Miedema, P. S.Extern*DESY* ; Engel, R. Y. ; Schunck, J.DESY* ; Redlin, H.DESY* ; Weigelt, H.DESY* ; Siewert, F. ; Behrens, C.DESY* ; Sinha, M.DESY* ; Schulte, A.Extern*DESY* ; Grimm-Lebsanft, B.Extern* ; Chiuzbăian, S. G. ; Wurth, W.CFEL*Extern*XFEL.EU*DESY* ; Beye, M.DESY* ; Rübhausen, M.CFEL* ; Brenner, G.DESY*

2020
AIP Publishing LLC Melville, NY

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Please use a persistent id in citations: doi:10.1063/4.0000029  doi:10.3204/PUBDB-2020-03171

Abstract: 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 high-resolution RIXS spectra in the energy range from 35 eV to 210 eV, thus spanning the M-edge (M$_1$ and M$_{2,3}$) absorption resonances of 3d transition metals and N$_{4,5}$-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) $μm^2$ (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/cm$^2$ 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/cm$^2$, 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.

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Contributing Institute(s):

1. FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)
2. FS-FLASH (FS-FLASH)
3. UNI/INF (CFEL-AO)
4. DOOR-User (DOOR ; HAS-User)
5. Laser Forschung und Entwicklung (FS-LA)

Research Program(s):

1. 6G2 - FLASH (POF3-622) (POF3-622)
2. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)

Experiment(s):

1. FLASH Beamline PG1 (FLASH)

Appears in the scientific report 2020

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