Stuttgart 2012 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 2: Precision Mass Spectrometry and Fundamental Applications I
MS 2.3: Vortrag
Montag, 12. März 2012, 14:45–15:00, V57.06
A New Method for Ion Separation in Penning Traps — Georges Audi1, Dietrich Beck2, Klaus Blaum3, Christine Böhm3, Christopher Borgmann3, Martin Breitenfeldt4, R. Burcu Cakirli3, Thomas Elias Cocolios5, Sergey Eliseev3, Sebastian George6, Frank Herfurth2, Alexander Herlert7, Jürgen Kluge2, Magdalena Kowalska5, Susanne Kreim3,5, David Lunney1, Enrique Minaya Ramirez2, Sarah Naimi8, Dennis Neidherr2, •Marco Rosenbusch9, Stefan Schwarz6, Lutz Schweikhard9, Juliane Stanja10, Meng Wang1, Frank Wienholtz9, Robert N. Wolf9, and Kai Zuber10 — 1CSNSMIN2P3-CNRS, Université de Paris Sud, Orsay, France — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 3Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 4Instituut voor Kernen Strahlingsfysica, Leuven, Belgium — 5CERN, Geneva, Switzerland — 6NSCL, Michigan State University, East Lansing, USA — 7FAIR GmbH, Darmstadt, Germany — 8RIKEN Research Facility, Japan — 9Ernst-Moritz-Arndt-Universität, Greifswald, Germany — 10Technische Universität, Dresden, Germany
The beams delivered by radioactive ion-beam (RIB) facilities mostly consist of a mixture of the ions of interest and other isobaric and isomeric species. However, experiments performed with such beams usually depend crucially on the purity of the ion ensemble. Ion purification by mass-selective buffer-gas cooling [1] in Penning traps has been employed successfully with resolving powers of up to 105. However, new techniques are are needed to further increase the resolving power or, equivalently, to reduce the duration of the separation process. In addition, buffer gases cannot be utilized in experiments which require a high vacuum, e.g. experiments with highly-charged ions. A new method for isobaric purification will be presented based on the superposition of a dipolar excitation of the magnetron motion of all trapped ions and a quadrupolar excitation at the cyclotron frequency of the ions of interest. Preliminary results of off-line measurements at the ISOLTRAP mass spectrometer at the RIB facility ISOLDE/CERN have shown a resolving power of 4·105 as for an excitation duration of 400ms.
[1] G. Savard et al., Phys. Lett. A 158, 247-252(1991).