Dresden 2011 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: New Mass Spectrometric Methods and Technical Developments

MS 8.1: Hauptvortrag

Donnerstag, 17. März 2011, 10:30–11:00, GÖR 229

First application of a multi-reflection time-of-flight mass separator to radioactive beams — •Robert N. Wolf — Ernst Moritz Arndt University of Greifswald, Germany

In most cases, radioactive ion beams are delivered only as a mixture of several isobaric species. This constitutes a major limitation for precision mass spectrometry of short-lived isotopes by use of Penning traps, since the simultaneous trapping of the nuclides of interest with contaminant ions leads to frequency shifts. The state-of-the-art procedure to remove unwanted ions – mass-dependent ion centering by resonant excitation while applying buffer-gas cooling – takes several 100 ms and works only for small ratios of “wanted“ to “unwanted“ ions. Thus, there is need for a cleaning method which not only conserves a high ion-of-interest throughput, in the case of strong contamination, but also works on short time scales. An auxiliary device for isobaric purification of rare-isotope ensembles, in the form of a multi-reflection time-of-flight mass separator (MR-ToF-MS), has recently been integrated into the Penning-trap mass spectrometer ISOLTRAP at the on-line isotope separator ISOLDE/CERN. The MR-ToF-MS device and the modifications of ISOLTRAP components required for its implementation will be described. In addition, the performance of the combined setup both in off-line tests as well as in first applications with radioactive beams will be presented.