Berlin 2014 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 6: Poster

MS 6.9: Poster

Mittwoch, 19. März 2014, 14:00–14:00, DO24 Foyer

Poly-Anion Production in Penning and RFQ Ion Traps — •Steffi Bandelow, Franklin Martinez, Gerrit Marx, and Lutz Schweikhard — Institute for Physics, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany

The poly-anion production is being investigated in Penning and linear radio-frequency quadrupole (RFQ) traps at the ClusterTrap setup. The range of anionic charge states produced with the electron-bath technique in a Penning trap is restricted by the upper mass limit of this trap. By installation of a cylindrical Penning trap with a 12-Tesla superconducting magnet, the mass and thus cluster-size range is enhanced by a factor of 20 compared to the previously used hyperbolic 5-Tesla Penning trap. For first experimental tests with the 12-Tesla cylindrical Penning trap, gold cluster mono-anions Aun-1, n = 330 - 350, have been exposed to an electron bath. As a result, higher negative charge states up to hexa-anionic clusters have been observed for the first time [1]. In a parallel effort, di- and tri-anionic gold clusters have been produced in an RFQ-trap [2]. To this end, an electron beam is guided through the RFQ-trap, which is operated by 2- or 3-state digital driving voltages [3,4]. In addition, both polyanion-production techniques have been combined by pre-charging clusters in the RFQ-trap, transferring the resulting dianions into the Penning trap and applying the electron-bath technique to produce higher charge states.

[1] Martinez et al., subm. to IJMS (2013). [2] Martinez et al., AIP Conf. Proc. 1521 (2013) 230. [3] Bandelow et al., IJMS 336 (2013) 47. [4] Bandelow et al., IJMS 353 (2013) 49.