Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Ultrafast Electron Dynamics III
O 79.5: Vortrag
Donnerstag, 20. März 2025, 11:30–11:45, H2
Time-resolved photoemission orbital tomography of 6T on Cu(110)-(2×1)O — •Marcel Theilen1, Monja Stettner2, Eric Fackelman2, Francois C. Bocquet2, Alexa Adamkiewicz1, Sarah Zajusch1, Siegfried Kaidisch3, Christian Kern3, Robert Wallauer1, Peter Puschnig3, F. Stefan Tautz2, and Ulrich Höfer1, 4 — 1Fachbereich Physik, Philipps-Universität Marburg — 2Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich — 3Institut für Physik, Universität Graz — 4Fachbereich Physik, Universität Regensburg
For ordered molecular layers, photoemission orbital tomography (POT) is a powerful technique for imaging the electron distribution of molecular orbitals in momentum space. When combined with laser pump-probe techniques, time-resolved photoemission orbital tomography (tr-POT) offers the ability to track the population dynamics of the excited molecular states on a femtosecond time scale[1].
In this talk, I will discuss our recent results obtained through tr-POT for three distinct, well-ordered layers of sexithiophene (6T) on a Cu(110)-(2×1)O surface: a monolayer, a bilayer and a multilayer. The focus will primarily be on the dynamics of the populated 6T LUMO via an optically HOMO-LUMO transition. For instance, a comparison between the individual layers reveals a significant extension of the LUMO lifetime with increasing layer thickness. Specifically, we find that the lifetime for the monolayer is less than 50 fs, while it increases to more than 600 fs for the multilayer.
[1] R. Wallauer et al., Science 371, 1056 (2021).
Keywords: time-resolved photoemission orbital tomography; sexithiophene