Düsseldorf 2007 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Poster

MS 7.5: Poster

Mittwoch, 21. März 2007, 16:30–18:30, Poster A

Investigation of the octupolar excitation with the FT-ICR detection scheme — •Martin Breitenfeldt¹, Sudarshan Baruah¹, Alexander Herlert², Franklin Martinez¹, Gerrit Marx¹, Lutz Schweikhard¹, Noelle Walsh¹, and Falk Ziegler¹ — ¹Institut für Physik, Ernst-Moritz-Arndt-Universität, Domstr. 10a, D-17487 Greifswald — ²Physics Department, CERN, CH-1211 Geneva 23

In the rapidly progressing field of mass spectrometry with Penning traps the manipulation of the eigenmotion of the ions by an octupolar rf field is a new approach to improve the relative uncertainty of measured frequencies Δν_c/ν_c. While an increase by a factor of two in the achievable resolving power is expected due to doubling the excitation frequency, it has been observed that the increase can be as high as a factor of ten [Eliseev et al., Ringle et al., both IJMS, in print]. In this contribution a method is presented to further study the excitation modes in general, and in particular to simultaneously monitor the change of the magnetron and cyclotron motion. The different behavior of these two eigenmotions under damping and decoherence due to collisions with background gas has been investigated. In addition, the shift of the eigenfrequencies caused by image charges in the ring electrodes has been studied.