Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Clusters III (with MO)

A 39.7: Vortrag

Freitag, 10. März 2017, 16:15–16:30, N 3

Photo excitation of size selected lead clusters — •Markus Wolfram¹, Stephan König¹, Franklin Martinez², Gerrit Marx¹, and Lutz Schweikhard¹ — ¹Ernst-Moritz-Arndt Universität, Greifswald, Deutschland — ²Universität Rostock, Rostock, Deutschland

At ClusterTrap [1] the photodissociation of positively and negatively charged lead clusters has been investigated. In addition to monomer evaporation we observe a further decay mode: At intermediate sizes (Pbn+, n=19-25, Pbn-, n=16-31) the main fragmentation pathway is the breaking off of a neutral heptamer, Pb*7. After preliminary experiments with a Nd:YAG laser (532nm), we plan to extend the available photon energies by use of an OPO laser system. Furthermore, by electron impact ionization of stored metal cluster cations [2] and simultaneous storage of cluster anions and electrons in the Penning Trap [3] the production of cluster cations and anions, respectively, of higher charge states has been achieved. Thus, it will be possible to extend the current studies to multiply charged lead clusters where further decay pathways are expected. In this contribution, recent modifications of the experimental setup and first results on the photo-excitation of size selected mono-anionic and cationic lead clusters will be presented.

The project is funded by the Collaborative Research Center (SFB) 652.

[1] F. Martinez et al., Int. J. Mass Spectrom. 365-366 (2014) 266 [2] L. Schweikhard et al., Hyp. Int. 99 (1996) 97 [3] A. Herlert et al., Phys. Scripta T80 (1999) 200