Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Molecular Clusters

MO 16.2: Hauptvortrag

Donnerstag, 3. März 2016, 11:30–12:00, f142

Far-infrared spectroscopy of metal cluster rare-gas complexes — David Yubero Valdivielso¹, Valery Chernyy², Dennis Palagin³, Joost M. Bakker², and •André Fielicke¹ — ¹Institut für Optik und Atomare Physik, Technische Universität Berlin, Germany — ²FELIX Laboratory, Faculty of Science, Radboud University Nijmegen, The Netherlands — ³Physical & Theoretical Chemistry Laboratory, University of Oxford, UK

Multiple photon dissociation spectroscopy in the far-infrared [1] is used to obtain vibrational spectra of transition metal clusters in the gas phase. More precisely, weakly bound complexes of the clusters with rare-gas atoms are irradiated with monochromatic light from an IR Free Electron Laser and their wavelength-dependent depletion is used as probe for the absorption process. Experimental far-IR spectra are typically recorded in the 85−500 cm⁻¹ region to cover the range of the structure-specific vibrational fundamentals, i.e., the finger-print range, for the metal clusters. Comparison with calculated vibrational spectra obtained, for instance, by using DFT methods, allows for structural assignments. I will present recent results for Ar solvation complexes of the cobalt cation, where by comparison with results from density functional theory calculations we identify distorted square, square pyramidal, and octahedral structures for CoAr₄⁺, CoAr₅⁺, and CoAr₆⁺, respectively. CoAr₅⁺, is a particularly interesting case as it appears to undergo rapid dynamics which finds its expression in a broad vibrational lineshape. A second example are the structures of binary cobalt-manganese clusters.

[1] A. Fielicke et al., Phys.Rev.Lett. 93 (2004) 023401.