Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 10: Focus Session Ultrafast Electron Microscopy at the Space-Time Limit II
O 10.7: Talk
Monday, March 17, 2025, 17:00–17:15, H2
Approaching Atomic Resolution in Ultrafast Transmission Electron Microscopy — •Sophie Schaible1,2, Till Domröse1,2, and Claus Ropers1,2 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, University of Göttingen, Germany
Ultrafast transmission electron microscopy (UTEM) [1] extends the study of structural heterogeneity in conventional TEM by introducing femtosecond temporal resolution, providing the means to map structural phase transitions at the nanoscale. However, access to atomic-scale ultrafast dynamics remains a major challenge due to the limited brightness of pulsed photoelectron beams. In this contribution, we explore approaches to atomic-resolution imaging of a structural transformation in a UTEM employing a high-coherence photoelectron source. Highly dose-efficient imaging is crucial to make optimum use of the available electron signal. We further gauge the impact of experimental parameters on the achievable spatiotemporal resolution such as sample drift, acquisition time, repetition rate and electron pulse length with and without optical excitation of the specimen.
[1] Feist et al. Ultramicroscopy 176 (2017)
Keywords: Ultrafast Transmission Electron Microscopy; Structural phase transitions; Atomic resolution imaging