Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TUE: Tuesday Contributed Sessions

TUE 12: Quantum Sensing and Decoherence: Contributed Session to Symposium III

TUE 12.3: Vortrag

Dienstag, 9. September 2025, 14:45–15:00, ZHG105

Measurement of electron wave phase shifts with Angstrom spatial resolution to analyse electric double layers — Jonas Lindner¹, Ulrich Ross^1,2, Tobias Meyer¹, Sung Sakong³, Axel Gross³, Michael Seibt², and •Christian Jooss¹ — ¹Institute of Materials Physics, University of Goettingen, Germany. — ²4th Institute of Physics, Solids and Nanostructures, University of Goettingen, Germany — ³Institute of Theoretical Chemistry, University Ulm, Germany

Using phase shifting off-axis holography in a transmission electron microscope (TEM), phase shift measurements of electron waves with 1 Angstrom spatial resolution and 2π/452 phase sensitivity was achieved. The detection of phase shifts is then applied to the measurement of atomic scale electric potentials of electric double layers at electrode water interfaces. The effect of inelastic scattering due to gas ambient on electron coherence is studied. The achieved progress in spatial resolution and phase detection allows us to observe ordered water layers at the dynamic state of a platinum (111) surface as well as water reorganization under applied electric potentials. The obtained projected electric potential of water dipole layers is quantitatively compared to ab-initio molecular dynamics simulations. The experimental results reveal an extended ordered water region. The bias-dependent reorientation of molecular dipole network gives new insights into the atomic scale electric field at Helmholtz layers and its impact on proton-coupled electron transfer at interfaces. Finally, we discuss general conclusions on quantum coherence of scattered matter waves.

Keywords: Electron wave phase detection; off-axis holography; atomic scale electric fields; electric double layer