Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Clusters in Molecular Physics (with MO & MS)

A 25.3: Vortrag

Mittwoch, 25. März 2015, 15:15–15:30, PH/SR106

(N)IR spectroscopy on two- and three-centered isolated cationic cobalt-, nickel- and cobalt/nickel - ethanol clusters — •Markus Becherer1, Daniel Bellaire1, Wei Jin2, Georgios Lefkidis2, Wolfgang Hübner2, and Markus Gerhards11TU Kaiserslautern, Fachbereich Chemie, Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern — 2TU Kaiserslautern, Fachbereich Physik, Erwin-Schrödinger-Straße 47, 67663 Kaiserslautern

Clusters containing transition metals and aliphatic ligands provide model systems regarding e.g. catalytical properties, magnetism, reactivity and structure. Thus, the successive variation of size and composition of the metal clusters can give a fundamental insight on possible cooperative effects. The investigated two- and three-centered pure and combined cationic cobalt, nickel clusters are produced by applying laser ablation to a rotating metal rod and by attaching the ethanol ligand in a supersonic beam. The frequencies and frequency shifts of OH and CH stretching vibrations (between different clusters) are probed by means of IR-photofragmentation spectroscopy. A structural assignment is performed by comparing the experimental data with calculated frequencies obtained from DFT calculations. In case of the isolated cationic (cobalt)3(ethanol)1 and (cobalt)3(ethanol)1(water)1 clusters both IR and electronic spectra (in the NIR region) are investigated through photodissociation spectroscopy. The experimentally observed spectra serve, among other aspects, as reference for theoretical calculations especially on the electronic transitions localized on the triangular Co trimer metal centre.

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