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MO: Fachverband Molekülphysik
MO 28: Ultrafast Dynamics IV
MO 28.2: Vortrag
Freitag, 14. März 2025, 11:15–11:30, HS XVI
Absolute Photoemission Timing of Surface-Oriented Iodoalkanes on Pt(111) — Pascal Freisinger1, •Sven-Joachim Paul1, Christian Schröder2, Konstantin Seidenfus1, Peter Feulner3, and Reinhard Kienberger1 — 1Chair for laser and x-ray physics, E11, Technische Universität München, Germany — 2University of California, Berkeley, USA — 3Surface and Interface Physics, E20, Technische Universität München, Germany
We report on attosecond streaking measurements of the electron photoemission process from the platinum (111) surface covered by surface-oriented iodoalkanes. Attosecond streaking enables measuring relative time delays in photoemission from two energetically different bound electronic states. This experiment investigated how the photoemission delay between the platinum valence band and the iodine 4d state in iodomethane, iodoethane, and atomic iodine depends on surface coverage.
Both Iodoalkanes align horizontally or vertically to the Pt(111) surface, depending on coverage. Therefore, changing the surface coverage changes the surface orientation of adsorbed iodomethane or iodoethane, thus enabling measuring photoemission delays under a fixed emission angle. This overcomes common attosecond streaking experiments in the gas phase, where the photoemission delay is averaged over the full solid angle.
Streaking atomic iodine enables referencing an established timing scheme in the gas phase, making retrieved photoemission delays comparable to gas phase measurements.
Keywords: Photoemission Timing; Attosecond Streaking; Iodine; Self-assembly