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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.56: Poster

Freitag, 6. April 2001, 12:30–15:00, AT3

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.