Freiburg 2024 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 22: Poster: Molecules in Strong Fields

MO 22.9: Poster

Donnerstag, 14. März 2024, 17:00–19:00, Tent C

Attosecond Chronoscopy of CO-Structures on Pt(111) — •Konstantin Seidenfus, Pascal Scigalla, Sven-Joachim Paul, and Reinhard Kienberger — Chair for Laser and X-Ray Phyisics, E11, Technische Universität München, Germany

This work investigates time delays occuring in the electron photoemission process of a Carbon-monoxide-covered Pt(111)-Surface, for which the attosecond streaking technique is used. The relative time delay in photoemission of multiple energetic differently bound electronic states can be measured with this technique. In this case, the platinum valence band is measured against the carbon valence band, at different coverages. A routine for sub-monolayer accurate, reproducible surface coverages of CO is developed and testet with TPD. Carbon monoxide has previously been investigated in the gas phase, where it was measured against a helium reference. CO orients itself vertically on the surface of the platinum crystal, whereas in gas the orientation is incoherent. This enables one to gain additional insight into the physical effect of an oriented potential on the photoemission process.

Keywords: Attosecond Streaking; photoemission time delay; surface-science; solid-state; LEED