Erlangen 2022 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 2: Poster

K 2.5: Poster

Dienstag, 15. März 2022, 16:30–18:30, P

A 100-kHz, high-brightness ultrafast electron diffraction set-up for sub-100-fs structural dynamics — •Fernando Rodriguez Diaz, Mark Meroe, Marc Vrakking, and Kasra Amini — Max Born Institute, Berlin, Germany

Photo-induced chemical reactions and phase transitions in gas-phase molecules and solid-state structures play an important role in biological processes and photoelectronics, such as photo-isomerization and photovoltaics. Such photo-induced processes occur on the few hundreds-to-thousands of femtoseconds timescale, with changes in the position of atoms in the molecular or lattice structure occurring on the sub-Angstrom spatial scale. So far, ultrafast electron diffraction (UED) has been utilized to visualize and track in real-time the structural dynamics of photo-induced reactions with sub-Å and sub-300-fs resolution. However, the temporal resolution of state-of-the-art UED set-ups, which operate at less than 5-kHz, is not sufficient to time-resolve some rapidly evolving photo-induced processes (e.g. <500-fs timescale of photo-isomerization). Here, we present a 100-kHz, 100-kV UED set-up recently built and commissioned at the Max-Born Institute, Berlin. Our set-up will be capable of operating in high-bunch charge single-shot mode (i.e. up to 1E6 electrons/pulse) or low-bunch charge high temporal resolution mode (i.e. less than 1E3 electrons/pulse) at 100-kHz. Using our set-up, we anticipate time-resolved measurements of photo-induced structural dynamics in solid-state and gas-phase systems with sub-Å spatial and sub-100-fs temporal resolution, which will go beyond the current state-of-the-art in UED.