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This is the webpage of the Fielicke group at the Technical University Berlin. In June 2017 we moved to the Fritz Haber Institute of the Max Planck Society

Institute for Optics and Atomic Physics Lasermolekülspektroskopie und Umweltphysik (Prof. Otto Dopfer)

Spectroscopy and Chemistry of Metal Clusters and Cluster Complexes

From left: Jasmin, David, Andre, Jenny (In our lab at the TU Berlin)
We apply spectroscopic tools for the investigation of strongly bound clusters in the gas phase to elucidate their geometric (and electronic) structures. Our main target is to obtain a fundamental understanding for the often unusual chemical properties of nano-scale materials.

Eine Zusammenfassung unserer Arbeiten in deutscher Sprache findet sich im Tätigkeitsbericht des Fritz-Haber-Institutes innerhalb des Jahrbuches der Max-Planck-Gesellschaft 2009.

11. July 2014: We have a new Doktor! Congratulations, Alex!

orbital interaction in Au10-

Angewandte Chemie: We report on the unexpected activation of molecular oxygen by cationic gold clusters and the formation of superoxo species.

frontispiece Eur Chem J

March 2014: Invited Concept article in Chemistry - A European Journal: Platinum group metal clusters: from gas-phase structures and reactivities towards model catalysts

15. Nov 2013: Christian successfully defended his PhD at the University of Nijmegen. Congratulations!

Nov 2013: We have performed the first experiments with the new IR-FEL at the Fritz-Haber-Institut der MPG.

Structures of platinum cluster cations

Communication in J. Chem. Phys.: We unravel the structures of small platinum clusters. Pt4+ and Pt5+' already favor three-dimensional geometries, in contrast to a number of earlier predictions.

Au o2.jpg

Angewandte Chemie: We investigate the activation of O2 by anionic gold clusters and unambiguously show the formation of superoxo (O2-) species on clusters containing an even number of Au atoms.


Tubes but no cubes: Small neutral MgO clusters tend to form six-ring based structures, but the cubic bulk motif is unfavorable.


In a Communication in Angewandte Chemie we report on the initial stage of methane activation on small platinum clusters.


We demonstrate a new method for determining vibrational spectra of anionic metal clusters: infrared resonance enhanced multiple photon electron detachment (IR-REMPED), where the cluster beam interacts with the IR radiation inside the cavity of FELICE, the new Free Electron Laser for IntraCavity Experiments at the FELIX facility.

IR active t2 mode of Au20

See here for our results on the structures of neutral gold clusters which have been published in Science.