Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)
MO 12.17: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
Auto-ponderomotive beam manipulation for interaction-free measurements with electrons — •Franz Schmidt-Kaler1, Nils Bode1, Fabian Bammes1, Michael Seidling1, Robert Zimmermann1, Justus Walther1, Lars Radtke1, and Peter Hommelhoff1,2 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2Department Physik, Ludwig-Maximilians-Universität München (LMU), 80799 München
Cryo-electron microscopy achieves angstrom resolution for biological samples but requires reconstructing images from hundreds of thousands of identical molecules due to electron beam damage. *Interaction-free* measurements with electrons offer the potential for true single-particle analysis of radiation-sensitive samples. This method, already explored in the optical domain, requires developing electron-optical elements such as beam splitters, resonators, and guides. We present a resonator for 50 eV electrons, a guide for up to 9.5 keV electrons, and determine the first Matthieu stability regime for auto-ponderomotive devices. Our goal is to integrate these components into standard SEMs for broader applicability.
Keywords: electron-optics; interaction-free measurement; matthieu stability regime; electron resonator; electron guide