Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 25: Poster – Cluster and Nanoparticles (joint session MO/A)

A 25.6: Poster

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

Detailed investigation of unexpected photoelectron spectra via angle-resolved spectroscopy of noble metal clusters — •Steve Takouan Tchounga, Lukas Weise, and Bernd von Issendorff — Physikalisches Institut, Albert-Ludwigs-Universität, Freiburg im Breisgau, Germany

Angle-resolved spectroscopy provides an important test of the theoretical description of clusters since these spectra carry more information than the bare electron binding energies. Specifically, the anisotropy of photoelectron spectra depends on the angular momentum state [1, 2].

The presented analysis utilizes the additional information from angle-resolved spectroscopy to gain a better understanding of the electronic structure of the cluster. For Au₃₃⁻ an electronic shell closing is expected, leading to the opening of a new shell for Au₃₄⁻. The angular momentum character of this new shell is not in accordance with a simple shell model.

The Issendorff’s model [2] was utilized to gain insight into the character of the orbital involved in the premature shell closing of Cu₉₁⁻. The β parameter curve for this orbital exhibits a clear f-type character, indicating a premature filling of the next shell. The reason for this premature shell closing cannot be identified by this result, but the additional information on the character should help in finding the reason.

[1] Bartels et al., Science, 323, 5919 (2009). [2] Piechaczek et al., Phys. Rev. Lett. 126, 233201 (2021). [3] Bartels et al., Phys. Rev. A 88, 043202 (2013).

Keywords: Gold clusters; Photoelectron; Angle-resolved spectroscopy; Cluster anions