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O: Fachverband Oberflächenphysik
O 92: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces II
O 92.4: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/1OG
Implementation of a bichromatic beamline for time-resolved two-photon momentum microscopy — •Martin Mitkov, Ralf Hemm, Florian Haag, Sebastian Emmerich, Sebastian Hedwig, Martin Aeschlimann, and Benjamin Stadtmüller — University of Kaiserslautern and Research Center OPTIMAS, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern
Mapping excited state dynamics in momentum space on a femtosecond time scale by time-resolved two-photon photoemission is an important prerequisite for understanding the optical and transport properties of new functional and materials. This is typically challenging for molecular materials due to their large ionization potential.
Here, we present a novel beamline for our momentum microscope [1] that is optimized for molecular spectroscopy with femtosecond time-resolution. It consists of a bichromatic UV beamline for 3eV pump, 6eV probe spectroscopy. The femtosecond time resolution will be demonstrated by cross-correlation measurements using a C60 multilayer film evaporated on Cu(111) as model system. For comparison, we will show autocorrelation traces recorded for the 3eV probe pulse on a clean Cu(111). Finally, the capability of our approach of time-resolved momentum microscopy for molecular materials will be discussed for the prototypical molecular system C60 on Cu(111).
[1] F. Haag et al., Rev. Sci. Instr. 90, 103104 (2019)