Hannover 2016 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Posters I
MS 5.1: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Isobar-free High Resolution On-Line Spectroscopy: New Features for the Laser Ion Source & Trap (LIST) at ISOLDE/CERN — •Carsten Weichhold1, Valentin Fedosseev4, Reinhard Heinke1, Tobias Kron1, Bruce Marsh4, Sebastian Raeder2, Tobias Reich3, Sven Richter1, Sebastian Rothe4, Pascal Schönberg3, Marcel Trümper1, 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 are of fundamental importance in the research field of nuclear properties at the edges of the chart of nuclei, where production yields at isotope generators such as ISOLDE at CERN are low and any background is overwhelming. To address this, the LIST combines the highly element-selective laser resonance ionization technique with suppression of isobaric contaminants inside a radiofrequency quadrupole structure. Today, the LIST is integrated as a routine-operational ion source at ISOLDE and has allowed investigations of previously not accessible isotopes.
In order to achieve higher resolution and to pave the way for isomer-selective ionization, a crossed laser/atom beam geometry inside the LIST quadrupole structure has been developed, reducing the spectral linewidth from a few GHz down to around 100 MHz. First off-line tests at the Mainz RISIKO mass separator, advantages, constraints as well as required refinements of this new PI(Perpendicular Illuminated)-LIST design are presented.