Stuttgart 2012 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Resonance Ionization MS, ICPMS and others I
MS 1.5: Vortrag
Montag, 12. März 2012, 11:45–12:00, V57.06
The Laser Ion Source and Trap (LIST) at CERN: Improving the Selectivity of the Resonance Ionization Laser Ion Source — •Daniel Fink1,2,3, Klaus Blaum2,3, Richard Catherall1, Bernard Crepieux1, Valentin Fedosseev1, Bruce Marsh1, Sven Richter4, Ralf Rossel1,4, Sebastian Rothe1,4, Thierry Stora1, Pekka Suominen1, and Klaus Wendt4 — 1CERN — 2Universität Heidelberg — 3Max-Plack-Institut für Kernphysik, Heidelberg — 4Universität Mainz
The on-line isotope mass separator ISOLDE at CERN is a facility dedicated to the production of a large variety of radioactive ion beams. Various experiments, coupled on-line, cover front-line research in, e.g., atomic, nuclear, and solid-state physics. A high ionization efficiency combined with ultimate isotope selectivity is of utmost importance for all on-line experiments on exotic, short-lived radionuclides with the lowest production rates. The ionization technique that most closely meets this requirement is the element selective Resonance Ionization Laser Ion Source (RILIS). Unfortunately, even when the RILIS is used, many rare isotope beams produced at ISOLDE remain contaminated with surface ionized isobars. In order to suppress the surface ions, a radio-frequency quadrupole device known as the Laser Ion Source and Trap (LIST) has been developed at the University of Mainz and at CERN. The LIST was tested at ISOLDE for the first time online at a radioactive beam facility in spring 2011. Characteristics such as transmission, selectivity, and ionization efficiency were determined. The results of the on-line run and the latest studies will be presented.