Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Focus Session: Time-Resolved Momentum Microscopy

O 68.10: Vortrag

Donnerstag, 8. September 2022, 18:15–18:30, H3

FEL-based time-of-flight momentum microscopy: 3 time-resolved photoemission modalities in 1 experiment — •D. Kutnyakhov¹, R.P. Xian², M. Dendzik², M. Heber¹, F. Pressacco³, S.Y. Agustsson⁴, L. Wenthaus¹, H. Meyer³, S. Gieschen³, K. Bühlman⁵, S. Däster⁵, R. Gort⁵, D. Curcio⁶, K. Volckaert⁶, M. Bianchi⁶, Ch. Sanders⁶, J.A. Miwa⁶, S. Ulstrup⁶, A. Oelsner⁷, C. Tusche^8,9, Y.-J. Chen^8,9, D. Vasilyev⁴, K. Medjanik⁴, G. Brenner¹, S. Dziarzhytski¹, S. Dong², J. Hauer², L. Rettig², J. Demsar⁴, H.-J. Elmers⁴, Ph. Hofmann⁶, R. Ernstorfer², G. Schönhense⁴, Y. Acremann⁵, and K. Rossnagel^1,10 — ¹DESY, Hamburg — ²FHI Berlin — ³CFEL, Univ. Hamburg — ⁴Univ. Mainz — ⁵ETH Zürich — ⁶Univ. Aarhus — ⁷Surface Concept GmbH, Mainz — ⁸FZ Jülich GmbH — ⁹Univ. Duisburg-Essen — ¹⁰CAU Kiel

Time-resolved photoemission spectroscopy with ultrashort pump and probe photon pulses is an emerging technique with wide application potential. The ultimate combination of valence-band and core-level spectroscopy with photoelectron diffraction in a single experiment for electronic, chemical, and structural dynamics analysis specifically requires tunable monochromatic soft X-ray pulses at a high repetition rate as well as highly efficient single-shot electron detectors with increased multi-hit capabilities. We have realized such a 3-in-1 ultrafast photoemission experiment at FLASH/PG2, DESY merging free-electron laser capabilities with a multi-dimensional recording scheme.