Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality
MO 10.16: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Gas Phase Vibrational Spectroscopy of Messenger-tagged Aluminum Oxide Clusters Anions — •Matias R. Fagiani1, Xiaowei Song1, Wieland Schöllkopf1, Sandy Gewinner1, Florian A. Bischoff2, Joachim Sauer2, and Knut R. Asmis1,3 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, D-12489 Berlin, Germany — 3Wilhelm-Ostwald-Institut, Universität Leipzig, Linnéstr. 2, D-04103 Leipzig, Germany
Alumina structures of reduced dimensionality are of interest in astrophysics and atmospheric chemistry, as well as in nanostructured ceramic materials and solid catalysts. Little is known, experimentally, concerning the geometric structure of such clusters. Vibrational spectroscopy combined with electronic structure calculations provides more detailed insight into the geometric and electronic structure of these clusters.
Here, we present infrared photodissociation (IRPD) spectra of aluminum oxide cluster anions, focusing mainly on the fully-oxidized, electronic closed-shell clusters. The cluster anions are formed in a sputtering source. Mass-selected anions are trapped, cooled to cryogenic temperatures and messenger-tagged (D2) in a buffer gas filled ion trap. Photodissociation spectra are measured from 400 to 1200 cm−1 with the widely tunable IR radiation of the free electron laser FHI FEL. The spectra are assigned and cluster structures are determined by comparison with the results of density functional calculations.