Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: MO Poster 4
MO 19.10: Poster
Thursday, March 12, 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