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MS: Massenspektrometrie
MS 3: Laser Resonance Ionization Mass Spectrometry
MS 3.5: Vortrag
Dienstag, 3. April 2001, 17:00–17:15, EB 202
RIMS with cw-Diode Lasers for Ultratrace Analysis of Plutonium — •J. Lassen1, P. Kunz1, J.V. Kratz2, C. Grüning2, G. Huber1, G. Passler1, N. Trautmann2, A. Waldek2, and K. Wendt1 — 1Institut für Physik, Universität Mainz, 55099 Mainz, Germany — 2Institut für Kernchemie, Universität Mainz, 55128 Mainz, Germany
Resonance Ionization Mass Spectrometry (RIMS) with pulsed dye or titanium-sapphire (TiSa) lasers has been established in our laboratory for ultratrace analysis of long-lived radiotoxic isotopes - especially plutonium - in environmental, biomedical and technical samples. However, for routine measurements these dye- and TiSa-laser systems are still rather complex and cost intensive. Therefore a new, compact, low maintenance RIMS-apparatus is being developed, which combines a commercial quadrupole mass-spectrometer (QMS) with tunable cw-diode lasers. The sample is atomized and autocollimated in an atomic beam source for Doppler reduction. In this way 3-step resonant exitation into an autoionizing state can be achieved with all cw-diode laser exitation. Thus isotope selectivity is obtained, adding to the overall selectivity of RIMS for ultratrace analysis. First applications with diode lasers and the atomic-beam-source-QMS-apparatus for ultratrace analysis of plutonium will be presented.
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