Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 79: Poster: Ultrafast Electron and Spin Dynamics at Interfaces
O 79.5: Poster
Wednesday, March 14, 2018, 18:15–20:30, Poster A
Time-resolved photoemission tomography of organic thin films — •Sebastian Hedwig1, Sebastian Emmerich1,2, Johannes Seidel1, Dominik Jungkenn1, Florian Haag1, Christina Schott1, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany
Photoemission tomography is a powerful method to correlate the momentum resolved photoemission yield of organic thin films to the shape of the molecular orbitals in real space [1]. Using static light sources, this technique has been successfully used to identify the emitting molecular orbitals of metal-organic interfaces or to determine the density of states of different molecules in heteromolecular structures [2]. Here, we extend this approach to the ultrafast timescale. By combining momentum microscopy with fs-XUV light sources, we are able to directly image the time-resolved evolution of occupied molecular orbitals and to access the momentum space pattern of unoccupied molecular orbitals. Here, we present our first results of the optically induced transient behavior of the momentum space signature of molecular orbitals of a C60 thin film. These results will be analyzed in the photoemission tomography approach to gain insight into transient changes of the molecular orbital during and after the optical excitation.
[1] Science 326 702 (2009), [2] Nat. Commun. 5, 3685 (2014)