Hannover 2016 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 4: Resonance Ionization MS and others
MS 4.4: Talk
Tuesday, March 1, 2016, 15:30–15:45, f128
Enhanced Isobaric Suppression in the Laser Ion Source & Trap (LIST) — •Marcel Trümper1, Valentin Fedosseev4, Reinhard Heinke1, Tobias Kron1, Bruce Marsh4, Sebastian Raeder2, Tobias Reich3, Sven Richter1, Sebastian Rothe4, Pascal Schönberg3, Carsten Weichhold1, and Klaus Wendt1 — 1Institute of Physics, Mainz University — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Institute of Nuclear Chemistry, Mainz University — 4CERN, Switzerland
Highly selective and efficient ion sources using laser resonance ionization are needed in order to provide isotopically pure ion beams of rare exotic nuclei at on-line facilities like ISOLDE/CERN. To gain access to isotopes with vanishingly low production rates, for which isobaric contaminations may completely overwhelm the isotope of interest, even more advanced isotope selective approaches are required. The laser ion source and trap LIST combines the high elemental selectivity of laser resonance ionization with electrostatic ion manipulation to suppress any remaining isobaric contaminations from surface ionization.
During final characterization of the LIST in recent off-line studies at the Mainz RISIKO mass separator, electron impact ionization was identified as another interfering ionization process generating isobaric contaminants. In order to adress this aspect, the LIST was enhanced by adding an additional electron-repelling electrode. Performance, advantages and constraints of this enhancement of the LIST will be discussed in this talk.