Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 104: Ultrafast Electron Dynamics III (joint session O/MA)

O 104.7: Vortrag

Donnerstag, 19. März 2020, 12:00–12:15, WIL B321

Polarisation effects in real space and real time in Xe-Cs solvatomers on Cu(111)John Thomas1, •Cord Bertram1,2, Ping Zhou1, Manuel Ligges1, Karina Morgenstern2, and Uwe Bovensiepen11Fakultät für Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany — 2Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, 44780 Bochum, Germany

For understanding solvation under spatial constraints, morphology and ultrafast electron dynamics of solvent-solute complexes on surfaces are essential. In this contribution, we present the influence of the rare-gas, non-polar solvent xenon on the electronic structure of Cs/Cu(111) investigated by Scanning Tunneling Microscopy (STM) and Two-Photon-Photoelectron Spectroscopy (2PPE). After adsorption of xenon onto Cs precovered Cu(111), Cs agglomerates in xenon islands to a distance within the islands that is limited by Coulomb repulsion. The cesium antibonding resonance attributed to the Cs 6s orbital shifts up in energy with increasing Xe coverage and the lifetime of the antibonding resonance is increased from 15 fs to 81 fs. We interpret these results as an enhanced localization of the antibonding resonance and a decoupling of Cs from Cu(111), mediated by the polarization response of Xe in the close vicinity of Cs. Such effects will be discussed in the context of solvation and de-solvation of Cs-Xe complexes on Cu(111). We acknowledge that this contribution is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy - EXC 2033 - Projektnummer 390677874.

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