SAMOP 2023 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 6: Poster I
MO 6.12: Poster
Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof
Attosecond Chronoscopy of organic iodine compounds on Pt111 — Sven Paul1, •Pascal Scigalla1, Christian Schröder1, 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 relative photoemission delay between the Iodine 4d state in organic iodine compounds like Iodoethane and -methane adsorbed on a Pt111 surface in respect to the Pt valence band. Iodine was chosen as a substituent in these organic molecules because of its giant dipole resonance in the 4d state, which results in a high cross section that is mostly unaffected by the rest of the molecule. The surface coverage of the organic iodine compounds on the Pt crystal is controlled via thermal programmed desorption. This is important because the orientation, i.e. horizontal and vertical configuration, of these adsorbents on the surface depends on the surface coverage. By using those two effects, we can ensure whether the detected photoelectrons have been perturbed by the whole organic chain or only by parts of it. A change in photoemission delay between both configurations is expected, as suggested by previous measurements for Iodoethane. Similar measurements are now made for Iodomethane as part of my master thesis, as we want to study the correlation of the photoemission delay with the length of the organic chain.