Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 5: Organic Molecules at Surfaces 1: Substrate Effects
O 5.4: Talk
Monday, September 5, 2022, 11:30–11:45, S051
Mapping of resonant excitation channels of C60/Cu(111) sample system through multiphoton polychromatic momentum microscopy — •Martin Mitkov1, Ralf Hemm1, Tobias Feuerbach1, Aaron Gebert1, Florian Haag1, Ka Man Yu1, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1TU Kaiserslautern and Research Center OPTIMAS, Erwin-Schrödinger Str. 46, 67663 Kaiserlsautern, Germany — 2Institut für Physik, Johannes-Gutenberg-Universität Mainz, Mainz 55128, Germany
Mapping the excited states of organic molecular thin films is of crucial importance for understanding the optical and transport properties of organic materials. Here, we present a multiphoton photoemission study of the excited states of the C60/Cu(111) interface for photon energies between 1.80 eV and 3.35 eV. Characteristic changes in the photoemission spectra for different photon energies allow us to determine the energetic positions of the excited states. In addition, we focus on the momentum-dependent photoemission pattern of the excited molecular states. The latter reveals distinct periodicities and symmetries based on the molecular orbitals involved in the optical excitation process. Altogether, this information will allow us to disentangle resonant intramolecular excitations from the Cu surface state. This allows us to uncover the photon energy-dependent excitation pathways of charge carriers at the C60/Cu(111) interface.