Bonn 2025 – scientific programme
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A: Fachverband Atomphysik
A 22: Poster – Attosecond Physics
A 22.5: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Photoemission Timing of Xe adsorbed on Pt(111) over a wide range of Xe layers — •Sven-Joachim Paul1, Luc Tremel1, Jasper Aeschlimann1, 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 the platinum (111) surface covered by xenon.
Attosecond streaking enables measuring relative time delays in photoemission from energetically different bound electronic states. This experiment addresses three states: Xe4d, Xe5s, and the Pt valence band.
Photoemission delays in these states have been observed for surface coverages ranging from 0.25 monolayers to 11 monolayers.
From a coverage of 3 monolayers, the Xe5s state became visible, enabling an internal delay measurement of the Xe states even without the need for the platinum valence band as a reference.
As xenon is a dielectric medium, the streaking field already acts in the adsorbed layers. Therefore, these measurements are more similar to gas phase measurements than experiments, which only address states of metals. On top of that, by comparing the photoemission delays for different layer thicknesses, the penetration depth of the streaking field can be estimated.
Keywords: Photoemission Timing; Attosecond Streaking; Xenon; Surface-science