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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Water on Surfaces

O 6.8: Vortrag

Montag, 1. April 2019, 12:30–12:45, H16

Local Signature of Solvated Electrons — •Cord Bertram1,2, Philipp Auburger3, Michel Bockstedte3,4, Julia Stähler5,6, Uwe Bovensiepen2,6, and Karina Morgenstern11Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum — 2Fakultät für Physik, Universität Duisburg-Essen — 3Lehrstuhl für Theoretische Festkörperphysik, Friedrich-Alexander Universität Erlangen-Nürnberg — 4Chemie und Physik der Materialien, Universität Salzburg — 5Physikalische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft — 6Fakultät für Physik, Freie Universität Berlin

Electron solvation, like any solvation, induces transient molecular rearrangements of the solvent molecules, which are important for understanding fundamental processes in various scientific fields like surface science and electrochemistry. We investigated the impact of electron solvation on the local, molecular structure at ice surfaces on Cu(111) with low temperature scanning tunneling microscopy, two-photon photoemission, and ab initio theory. UV photons generate excited electrons in Cu(111), which penetrate the conduction band of the ice and solvate at its surface. The electron solvation leads not only to a transient reorientation of water molecules on ice surfaces, but also to permanent structural changes and the motion of individual molecules. These changes occur predominantly close to defect sites because of the defect’s abundance of polar dangling OH groups. Our results suggest that fast energy dissipation during solvation triggers permanent molecular rearrangement via vibrational excitation. This work is supported by the DFG through the cluster of Excellence RESOLV (EXC 2033).

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