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MS: Fachverband Massenspektrometrie

MS 5: Ionenfallen und Cluster

MS 5.1: Vortrag

Mittwoch, 21. März 2007, 11:30–11:45, 5F

Simultaneous Monitoring of the Radial Modes of the Ion Motion and their Manipulation in Penning traps by FT-ICR MS — •Martin Breitenfeldt¹, Falk Ziegler¹, Alexander Herlert², Gerrit Marx¹, and Lutz Schweikhard¹ — ¹Institut für Physik, Ernst-Moritz-Arndt-Universität, Domstr. 10a, D-17487 Greifswald — ²Physics Department, CERN, CH-1211 Geneva 23

It is demonstrated how FT-ICR MS can be used to monitor both the coherent magnetron motion and the cyclotron motion of ions stored in a Penning trap. By repeated measurements of the ICR signal intensity at the magnetron frequency, ν₋, and the reduced cyclotron frequency, ν₊, the manipulation of the ion motion by dipolar, quadrupolar, and octupolar excitation has been followed. In particular, the conversion between the magnetron and the cyclotron motion by quadrupolar and octupolar excitation at the corresponding resonance frequencies ν_c = ν₊ + ν₋ and 2ν_c, respectively, after a preceding dipolar excitation of the magnetron motion, has been observed by detection of both the magnetron and the cyclotron signal. In the case of octupolar excitation this is the first experiment where the resonance is monitored via a signal directly related to the magnetron motion. Moreover, it is demonstrated that FT-ICR MS allows the simultaneous monitoring of the excitation effect on both the cyclotron and the magnetron motion.