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O: Fachverband Oberflächenphysik
O 6: Organic Molecules on Inorganic Substrates I: Electronic, Optical and other Properties
O 6.3: Vortrag
Montag, 16. März 2020, 11:15–11:30, REC C 213
Dynamic Momentum Mapping of Excited Molecular Wave Packets — •Kiana Baumgärtner1, Markus Scholz2, Christian Metzger1, Chul-Hee Min1, Thiago R. F. Peixoto1, Dmytro Kutnyakhov3, Michael Heber3, Federico Pressacco4, Wilfried Wurth3,4, Anders Madsen2, and Friedrich Reinert1 — 1Experimentelle Physik 7, Julius-Maximilians-Universität Würzburg, Germany — 2European XFEL, Germany — 3DESY Hamburg, Germany — 4Universität Hamburg, Germany
In the last decade [1], the interpretation of the momentum distribution from static angle-resolved photoemission experiments has improved our understanding of charge transfer processes at the molecule-metal-interface [2], vibronic progression [3] as well as the geometric alignment in these systems [4]. In this contribution I will present our experimental findings on time-resolved orbital mapping of excited molecular states. We conducted pump-probe experiments on pentacene bilayers atop Ag(110) at a free-electron-laser facility with a momentum microscope. Pentacene presents an ideal material system to study not only because of its broad applicability in devices such as OFETs and OLEDs but it is also well characterized by static experiments [4,5] and it has the potential to showcase ultrafast photoinduced processes such as singlet fission.
[1] P. Puschnig et al., Science 326, 702 (2009). [2] G. Zamborlini et al., Nat. Comm. 8, 335 (2017). [3] M. Graus et al., Phys. Rev. Lett. 116, 147601 (2016). [4] M. Grimm et al., Phys. Rev. B 98, 195412 (2018). [5] M. Scholz et al., arXiv:1907.10434.