Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Poster Ultrafast Electron Dynamics
O 23.17: Poster
Monday, March 17, 2025, 18:00–20:00, P2
Control and manipulation of low-energy electrons — •Dennis Epp1, Frank Long1,2, Benjamin Schröder1, and Claus Ropers1,2 — 1Max-Planck-Institute for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, University of Göttingen, Germany
In surface science and materials physics, electron pulses are a powerful probe of structural dynamics in time-resolved diffraction and microscopy experiments. A fundamental challenge lies in the Coulomb interaction [1] and initial energy distribution, which negatively affects the electron beam size and pulse duration after propagation towards the sample. Active control of electron pulse properties by compression schemes has proven to enhance temporal resolution [2-4]. This is particularly important for low-energy electrons and their high dispersion due to low propagation velocity [4]. In this paper, we demonstrate longitudinal and transversal phase-space manipulation of low-energy electron pulses using synchronized RF fields in the gigahertz frequency range [4]. Furthermore, novel beam shaping concepts including electron pulse streaking, compression and deflection are discussed.
[1] van Oudheusden, et al., Physical Review Letter 105, 264801 (2010). [2] Kassier, et al., Applied Physics B 109, 249-257 (2012). [3] Epp, et al., Structural Dynamics 11, 024306 (2024). [4] Haindl, et al., Nature Physics 19, 1410*1417 (2023).
Keywords: low-energy electrons; pulse compression; high-frequency fields; electron manipulation