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O: Fachverband Oberflächenphysik

O 18: Poster Focus Session Ultrafast Electron Microscopy at the Space-Time Limit

O 18.5: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Characterization and Improvement of the Electron Beam Stability and the Measurement Noise in Ultrafast Low-Energy Electron Microscopy — •Ole Böttger^1,2, Johannes Otto^1,2,3, Leon Brauns^1,2, and Claus Ropers^1,2,3 — ¹Department of Ultrafast Dynamics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — ²4th Physical Institute, University of Göttingen, Göttingen, Germany — ³Max Planck School of Photonics

Ultrafast Low Energy Electron Microscopy (ULEEM) promises to uncover real-space dynamics on surfaces with few-picosecond temporal and nanometer spatial resolutions. Our group is currently developing such an instrument and has obtained first promising results [1]. The extended measurement durations required in this scheme require a high degree of long-term stability of the system. Here, we present results of energy, beam position and intensity stability measurements under various operating conditions, applied to both the laser pump and electron probe beam used. Moreover, we show results of state-of-the-art drift correction algorithms [2] applied to first ULEEM data [1].

[1] J. Otto et al., in preparation (2024).

[2] T. A. de Jong et al., Ultramicroscopy 213, 112913 (2020).

Keywords: ULEEM; Stability; Ultrafast; LEEM