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O: Fachverband Oberflächenphysik

O 54: Poster Session IV: Poster to Mini-Symposium: Ultrafast surface dynamics at the space-time limit II

O 54.4: Poster

Tuesday, March 2, 2021, 13:30–15:30, P

3-in-1 time-resolved ToF momentum microscopy using FEL and HHG radiation — •N. Wind^1,2, D. Kutnyakhov², M. Heber², F. Pressacco², L. Wenthaus², G. Mercurio³, H. Meyer¹, S. Gieschen¹, K. Bühlmann⁴, D. Curcio⁵, K. Volckaert⁵, S. Däster⁴, R. Gort³, M. Bianchi⁵, C. Sanders⁵, J. Miwa⁵, S. Ulstrup⁵, A. Oelsner⁶, C. Tusche^7,8, Y.J. Chen^7,8, S.Y. Agustsson⁹, D. Vasilyev⁹, K. Medjanik⁹, G. Brenner², S. Dziarzhytski², H. Redlin², J. Hauer¹⁰, P. Xian¹⁰, M. Dendzik¹⁰, S. Dong¹⁰, L. Rettig¹⁰, F. Diekmann¹¹, H.J. Elmers⁹, J. Demsar⁹, P. Hofmann⁵, R. Ernstorfer¹⁰, Y. Acremann⁴, M. Martins¹, G. Schönhense⁹, W. Wurth^1,2, and K. Rossnagel^2,11 — ¹IEXP, Univ. Hamburg — ²DESY Hamburg — ³EuXFEL Schenefeld — ⁴ETH Zürich — ⁵Univ. Aarhus — ⁶Surface Concept GmbH — ⁷FZ Jülich GmbH — ⁸Univ. Duisburg-Essen — ⁹Univ. Mainz — ¹⁰FHI Berlin — ¹¹CAU Kiel

Time-resolved PES with ultrafast pump and probe pulses is an emerging technique with wide application potential. Combining valence-band and core-level spectroscopy with photoelectron diffraction in a single, ultra-efficient photoelectron detection scheme for electronic, chemical and structural analysis requires soft X-ray pulses of few 10 fs duration at some 10 meV spectral resolution. This is feasible at high-repetition-rate FELs. We present an optimized, versatile setup for the use at FLASH as well as a laboratory HHG source that combines short-pulsed XUV/soft X-ray capabilities with a multidimensional recording scheme for ultrafast photoemission studies of quantum materials.