Mainz 2026 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Poster – Cluster and Nanoparticles (joint session MO/A)

MO 21.4: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG

Novel Apparatus for Synchrotron X-ray Photoelectron Spectroscopy of Size-Selected Gas-Phase Clusters — Lotar Kurti, Phillip Stöcks, Fabian Bär, Lukas Weise, and •Bernd v. Issendorff — Physikalisches Institut, Universität Freiburg, Freiburg, Germany

A newly developed apparatus enables X-ray photoelectron spectroscopy on mass-selected cluster ions at synchrotrons. The heart of this system is a liquid nitrogen-cooled linear Paul trap, where stored cluster ions interact with synchrotron radiation. The emitted electrons are guided by a specially designed magnetic field into a Hemispherical Energy Analyzer, where the photoelectron spectra are recorded. Clusters are produced in a magnetron cluster source, mass-selected using a quadrupole mass spectrometer, and then introduced into the linear ion trap. This setup will allow for element-specific binding energy measurements of core levels and hence detailed insights into the chemical bonding of pure and mixed metal and semiconductor clusters. In this contribution, we present the current status of the new apparatus and some initial commissioning results.

Keywords: photoelectron spectroscopy; cluster ion; ion trap; Hemispherical Energy Analyser; synchrotron radiation