Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 25: X-ray Spectroscopy

MO 25.7: Vortrag

Donnerstag, 13. März 2025, 16:15–16:30, HS XVI

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, Hermann-Herder-Str. 3, D-79104 Freiburg, Germany

A newly developed apparatus enables X-ray photoelectron spectroscopy on mass-selected cluster ions at synchrotrons for the first time. The system’s centerpiece is a liquid nitrogen-cooled linear Paul trap, where stored cluster ions interact with synchrotron radiation. The emitted electrons are directed by a specially designed magnetic field into a Hemispherical Energy Analyzer, where photoelectron spectra are captured. Clusters are generated in a magnetron cluster source, mass-selected using a quadrupole mass spectrometer, and then introduced into the linear ion trap. This setup enables element-specific binding energy measurements of core levels, providing detailed insights into the chemical bonding of pure and mixed metal and semiconductor clusters. Additionally, we will present initial test spectra of emitted electrons recorded with the apparatus, demonstrating its ability to capture high-resolution photoelectron spectra and validating its potential for advancing studies in cluster ion chemistry and bonding.

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