SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Ultrafast Electron Dynamics at Surface and Interfaces II
O 16.9: Vortrag
Montag, 27. März 2023, 17:15–17:30, TRE Phy
Ultrafast electron dynamics at D2O/Na+/Cu(111) interfaces — •Florian Kühne1, Jayita Patwari1,2, Ping Zhou1, Karina Morgenstern2, and Uwe Bovensiepen1 — 1Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen — 2Department of Chemistry and Biochemistry, Ruhr-University Bochum
Ion-solvent interactions and electron transfer across the ion-metal hybrid interfaces are of fundamental interest because of their widespread application in energy storage and energy conversion. We aim to understand the effect of solvation on the elementary processes involved in electrochemical applications by developing a microscopic insight into the hybrid interfaces in presence of a solvent. Electron transfer across such interfaces and the consequent relaxation dynamics are the key microscopic steps behind all these applications which occur on femtosecond time scales. Thus, to experimentally analyze the underlying elementary dynamics, we use femtosecond time-resolved two-photon photoelectron spectroscopy (tr-2PPE). We discuss the influence of the solvent at the D2O/Na+/Cu(111) interface. We conclude on the local structure - dynamics relation as a function of D2O coverage from the measured energy transfer rate determined by the transient energy shift of the Na 3s resonance on Cu(111). We analyze furthermore the screening of the excited electron in this resonance by the solvent based on the relaxation time variation with D2O coverage.
Funding by the DFG through Project No. 278162697 - SFB1242 and EXC 2033 - 390677874 - RESOLV are gratefully acknowledged.