Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Poster: Molecules in Strong Fields
MO 22.8: Poster
Donnerstag, 14. März 2024, 17:00–19:00, Tent C
Attosecond Electron Dynamics of Surface-Oriented Iodomethane on Pt(111) — •Sven-Joachim Paul1, Pascal Scigalla1, Christian Schröder1, Konstantin Seidenfus1, Peter Feulner2, and Reinhard Kienberger1 — 1Chair for laser and x-ray physics, E11, Technische Universität München, Germany — 2Surface and Interface Physics, E20, Technische Universität München, Germany
We report on attosecond streaking measurements of the electron photoemission process from Pt(111) surfaces covered in well-oriented iodomethane molecules. Attosecond streaking allows for the measurement of relative time delays in photoemission from two energetically different bound electronic states. For this experiment, the photoemission from the platinum valence band has been timed against the photoemission of the iodine 4d orbital in iodomethane. A routine has been developed to control the self-assembly surface orientation process of the adsorbed iodomethane molecules by varying the coverage of the Pt(111) crystal. Depending on the surface coverage, iodomethane aligns vertically or horizontally on the surface. This enables the study of photoemission dynamics through a well-oriented potential. Attosecond streaking has then been systematically performed for nine different surface coverages, most of them in the sub-monolayer regime. With that, first-ever insights into the influence of adsorbate potential orientation and density on photoemission delay were possible.
Keywords: attosecond streaking; photoemission time delay; surface-science; self-assembly; solid-state