Freiburg 2024 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 18: Poster: Cluster

MO 18.5: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent C

High-resolution photoelectron spectroscopy on tantalum and gold clusters — •Maziyar Kazemi, Fabian Bär, and Bernd v.Issendorff — Institute of Physics University of Freiburg

The characteristics of deeply cold tantalum clusters (Ta4* to Ta23*) and gold clusters (Au3* to Au40*) have been studied using high-resolution photoelectron spectroscopy at 3.9K. Our magnetic bottle time-of-flight photoelectron spectrometer, which employs a time-dependent deceleration for electron package focusing, possesses an energy resolution of ΔE/E = 0.22% (5.5 meV at 2.0 eV kinetic energy for Pt ions). This is five times better than a conventional magnetic bottle spectrometer and competitive with hemispherical energy analyzers, which have the disadvantage of a significantly smaller collection efficiency. Combining the improved spectrometer with a low-jitter, short-pulse picosecond laser operating at 211 nm enables us to inspect states bound with up to 5.9eV binding energy with unprecedented resolution. This allows us to observe features like vibrational progressions or contributions from different isomers that have not been resolved before.

Keywords: Gold Cluster; tantalum Cluster; High-resolution photoelectron spectroscopy; magnetic bottle