Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Atomic clusters II (with MO)

A 15.4: Vortrag

Dienstag, 1. März 2016, 15:15–15:30, f107

Photo excitation of size and charge-state selected multi-anionic aluminum clusters — •Markus Wolfram¹, Stephan König¹, Franklin Martinez², Gerrit Marx¹, Lutz Schweikhard¹ und Albert Vass¹ — ¹Felix-Hausdorff-Straße 6,Institut für Physik, Greifswald, Deutschland — ²University of Rostock, Germany

Studies of photo excited di-anionic gold clusters indicated that in addition to the well known competing mechanisms of electron detachment and cluster fragmentation the simultaneous emission of two electrons is another possible decay channel. However, in this case the neutral product cluster was no longer stored in the Penning trap and therefore could not be detected. In the meantime, by simultaneously storing cluster anions and electrons the production of gold and aluminum cluster anions of up to the sixth and tenth charge state, respectively, has been achieved. Furthermore, the experimental procedures for cluster preparation have been refined using the SWIFT (Stored Waveform Inverse Fourier Transform) technique. Thus, it is now possible to investigate the photo-induced decay pathways of stored anionic clusters as a function of cluster size n and charge state z beyond the dianions. After preliminary experiments with Nd:YAG laser beams, it is planned to extend the available photon energies by use of an OPO laser. In this contribution the recent modifications of the experimental setup and first results on the photo excitation of size and charge-state selected multi-anionic aluminum clusters will be presented. The project is funded by the Collaborative Research Center (SFB) 652