Mainz 2026 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Resonance Ionization Spectroscopy / Mass Spectrometry
MS 1.5: Vortrag
Montag, 2. März 2026, 12:45–13:00, N 6
Ionization efficiency measurements of actinides using Ti:Sa Lasers at RISIKO — •Raphael Hasse1,2,3, Felix Berg1, Sebastian Berndt1, Michael Block1,2,3, Christoph E. Düllmann1,2,3, Sebastian Raeder2,3, Tobias Reich1, and Klaus Wendt1 — 1Johannes Gutenberg-Universität, Mainz — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Helmholtz-Institut, Mainz
Resonance ionization mass spectrometry (RIMS) is the combination of element selective resonant laser excitation and ionization with subsequent mass separation which is a powerful technique for laser spectroscopy and ultra-trace analysis particularly for the actinides. For quantitative measurements towards reliable determination of elemental ratios the precise characterization of the ionization schemes used is essential. In this context, the laser ionization efficiencies of the environmentally relevant actinides Pu, Np and Cm are discussed, which were determined at the RISIKO mass separator at the Johannes Gutenberg University Mainz. With efficiencies well above 10 %, the range of elements with high ionization efficiencies is extended to include the actinides. In combination with the saturation behavior of each individual excitation step we gain important information on the ionization schemes. And additionally different ionization schemes in Pu are compared with respect to the overall efficiencies of different three-step schemes with the favored selective two-step scheme.
Keywords: Ionization efficiency; actinides; RIMS