Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 29: Atomic clusters (with MO)

A 29.4: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Production of size and charge-state selected poly-anionic metal clusters with a multipole RF-trap — •Stefan Knauer, Gerrit Marx, and Lutz Schweikhard — Institut für Physik, Universität Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald

Poly-anionic metal clusters are experimentally not yet investigated to large extent, they may well reveal particularly interesting properties and behavior [1]. The aim is to lift initially mono-anionic clusters to higher charge states by subsequent electron attachment inside a RF-trap [2-4]. These traps cannot store electrons and clusters at the same time. However, electron attachment is facilitated by providing field-free conditions for the passage of an electron beam. This can be accomplished by use of a multipole ring-electrode trap, which provides continuously an almost field free region [5]. The experiment is build to provide defined charge states for laser interaction experiments. The contribution will present the ring-electrode trap mentioned above as well as first cluster confinement tests. The project is supported by a Collaborative Research Center 652 of the DFG.

[1] A. Herlert et al., New J. Phys. 14, 055015 (2012), DOI: 10.1088/1367-2630/14/5/055015 [2] C.Yannouleas et al., Phys. Rev. Lett. 86 2996 (2001), DOI: 10.1103/PhysRevLett.86.2996 [3] F. Martinez et al., Int. J. Mass Spectrom. 365, 266 (2014), DOI: 10.1016/j.ijms.2013.12.018 [4] S. Bandelow et al., Int. J. Mass Spectrom. 336, 47 (2013), DOI: 10.1016/j.ijms.2012.12.013 [5] D. Neuwirth et al., Int. J. Mass Spectrom 387, 8 (2015), DOI: 10.1016/j.ijms.2015.06.011