Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 79: Ultrafast Electron Dynamics III
O 79.2: Talk
Thursday, March 20, 2025, 10:45–11:00, H2
Ultrafast table-top three-dimensional photoemission orbital tomography — •G. S. Matthijs Jansen1, Wiebke Bennecke1, Thi Lan Dinh2, Jan Philipp Bange1, David Schmitt1, Marco Merboldt1, Lennart Weinhagen1, Bent van Wingerden1, Fabio Frassetto3, Luca Poletto3, Marcel Reutzel1, Daniel Steil1, D. Russell Luke2, and Stefan Mathias1 — 1University of Göttingen, I. Physikalisches Institut, Göttingen, Germany — 2University of Göttingen, Institute of Numerical and Applied Mathematics, Göttingen, Germany — 3Institute for Photonics and Nanotechnologies CNR-IFN, 35131 Padova, Italy
In photoemission orbital tomography (POT), molecular orbitals can be imaged with femtosecond resolution. Also, when combined with photon-energy-dependent measurements, POT is, so far, the only method that can probe the orbitals of adsorbed molecules in 3D. However, the study of, e.g., hybridization in organic/inorganic heterostructures [Bennecke et al., arXiv:2411.14993 (2024)] by 3D-POT is extremely challenging due to the demanding nature of the experiment. Here, we present a table-top approach for 3D POT: By combining a photoelectron momentum microscope with a pulse-preserving monochromator for laser-generated extreme ultraviolet light, we speed up data acquisition. Moreover, we developed a new reconstruction algorithm that reduces the sampling requirements by about an order of magnitude [Dinh et al., New J. Phys. 26 043024 (2024)]. Our first results achieved on PTCDA/Ag(110) highlight the potential for ultrafast femtosecond time-resolved 3D-POT.
Keywords: ARPES; Photoemission orbital tomography; 3D orbital imaging