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MO: Fachverband Molekülphysik

MO 19: Poster 3

MO 19.4: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

New apparatus for synchrotron-based photoelectron spectroscopy of cold, mass-selected and cold ions in the gas phase — •Phillip Stöcks, Fabian Bär, Lukas Weise, and Bernd v. Issendorff — Physikalisches Institut der Albert-Ludwigs-Universität Freiburg

A novel instrumentation is under development for photoelectron spectroscopy of gas phase ions, aiming for wide exploitation of the potential of synchrotron radiation sources like BESSY II for the study of mass-selected nanoparticles, complexes and molecules.

The setup will make use of the strongly increased ion density in an ion trap for photoelectron spectroscopy of size-selected cluster or molecular ions with synchrotron radiation. Photoelectrons emitted by the ions inside the ion trap will be guided by a tailored magnetic field out of the ion trap, extracted from the magnetic guiding field by custom designed electron optics, and transferred into a hemispherical energy analyser with a position sensitive detector. By employing this method, photoelectron intensities can be obtained that are orders of magnitude higher than by direct irradiation of an ion beam. This worldwide unique setup will make core-levels and the full valence band of free ions routinely accessible for the first time and can be used for a broad range of studies, from the characterisation of the electronic structure of transition metal clusters and organometallic complexes via core-level shifts, to the examination of reactions on the surface of catalytically active nanoparticles; tackling problems of both, fundamental importance and direct technological relevance.