SAMOP 2023 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Poster II

MO 13.19: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

New apparatus for synchrotron-based photoelectron spectroscopy of cold and mass-selected ions in the gas phase — Stöcks Phillip, Bär Fabian, Weise Lukas, and •von Issendorff Bernd — Insitute of Physics at the University of Freiburg, Freiburg i.Br., Germany

We present the development and construction of a new apparatus for cluster research at the BESSY II synchrotron at the Helmholtz Centre in Berlin (HZB). A magnetron sputter source provides the clusters for the apparatus. The setup allows mass selection with a Quadrupole Mass Spectrometer (QMS) before the clusters are stored. The trap is a linear Radio Frequency (RF) trap. Photoelectrons are emitted through interaction with the synchrotron beam. These are forced out of the trap with a magnetic field using the principle of the magnetic bottle on parallel trajectories in one direction. In this way, sufficient intensities can be achieved. The photoelectrons then pass through a magnetic guiding field and experience a deflection from the synchrotron axis. Subsequently, the photoelectrons are directed and focused by electric ion optics so that the photoelectrons can be guided into the Hemispherical Spectrum Analyser (HSA) as magnetic field-free as possible. At the current state of the project we will especially focus on the simulated photoelectron paths guided and focused by our newly developed photoelectron extractor. Furthermore the detailed design of the whole experiment will be introduced.