Stuttgart 2012 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 3: Resonance Ionization MS, ICPMS and others II
MS 3.1: Hauptvortrag
Montag, 12. März 2012, 16:30–17:00, V57.06
The resonance ionization laser ion source RILIS - leading all-rounder of on-line ion sources — •Sebastian Rothe1,2, Valentin Fedosseev1, Daniel Fink1, Ralf Rossel1,2,3, Maxim Seliverstov1, and Klaus Wendt2 — 1CERN, Geneva, Switzerland — 2Institut für Physik, Uni Mainz, Germany — 3Hochschule RheinMain, Wiesbaden, Germany
The resonance ionization laser ion source (RILIS) of the on-line isotope separator facility ISOLDE at CERN, is based on the method of stepwise resonant laser excitation and ionization of atoms. The element selectivity of the RILIS complements the mass selection process of the ISOLDE separator magnets to provide high purity ion beams of many isotopes. The RILIS, which now includes two complementary and independent tunable laser systems (dye and titanium:sapphire lasers), has been significantly improved since its first demonstration of selective ionization of Yb isotopes in 1992. Today, on account of the high degree of selectivity for the 27 elements now offered, the annual operation of RILIS exceeds 2500 h, making it the most versatile and commonly used ion source at ISOLDE. The use of a narrow band dye laser enables precision in-source laser spectroscopy of isotope shifts and hyperfine structures of isotopes far from stability as well as the production of isomer pure beams as has been demonstrated for Ag, Cu, Pb, Bi, Po, and Tl . A recent upgrade of the RILIS comprises the incorporation of a complementary all solid state laser system as well as the Laser Ion Source Trap (LIST), which greatly enhances selectivity by suppressing any surface ionized isobars.