Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 16: Poster Monday: Ultrafast Processes 1

O 16.8: Poster

Monday, September 5, 2022, 18:00–20:00, P4

Laser-based low energy photoelectron diffraction of SnPc/graphite — •Hermann Erk, Stephan Jauernik, Petra Hein, and Michael Bauer — IEAP, CAU Kiel, Germany

Tin-phthalocyanine (SnPc) adsorbed on graphite has been studied using laser-based angle resolved photoemission spectroscopy (ARPES) at 5.9 eV photon energy and low energy electron diffraction (LEED). An ordered SnPc monolayer was prepared by thermal evaporation onto single crystalline graphite (SCG) flakes and subsequent annealing at 370 K. LEED data reveal an incommensurate ordered phase of the SnPc overlayer at room temperature. In the ARPES spectra the SnPc long-range order can be seen due to an adsorbate-induced backfolding of the band structure of graphite from the K point to the center of the Brillouin zone. A comparison of ARPES spectra with simulations of the backfolded band structure under consideration of the LEED data will be discussed. First time-resolved ARPES measurements with the aim to address ultrafast changes in the SnPc long range order will be presented.