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MO: Fachverband Molekülphysik

MO 19: MO Poster 4

MO 19.10: Poster

Donnerstag, 12. März 2020, 17:00–19:00, Empore Lichthof

Optical properties of cationic gold clusters — •Marko Förstel¹, Kai Pollow¹, Karim Saroukh¹, Este A. Najib¹, Alice Green², Stuart Mackenzie², and Otto Dopfer¹ — ¹Institut für Optik und Atomare Physik, Technische Universität Berlin, Germany — ²Department of Chemistry, University of Oxford, Oxford, UK

Gold is one of the most important model systems in catalysis research. The catalytic properties are strongly dependent on local structure and electronic properties and may change drastically by changing the number of atoms by only one [1]. Unfortunately, due to intrinsic properties of Au, theoretical calculations are not straight forward and methods still need to be improved.

Our newly enhanced setup allows measuring the optical absorption spectra of small gold clusters in hitherto unprecedented quality [2, 3]. Here we present our latest results on small bare and substituted gold clusters cations. We compare the experimentally obtained optical spectra to TD-DFT calculations to draw conclusions about the structure of the excited states, or, correspondingly, use the known structures to benchmark theoretical methods.

[1] S. Lang et al., Angew. Chem. Int. Ed. 10, 2017

[2] M. Förstel et al., Rev. Sci. Instr. 88, 2017

[3] M. Förstel et al., Angew. Chem. Int. Ed. 131, 2019