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MS: Fachverband Massenspektrometrie
MS 9: Poster
MS 9.1: Poster
Wednesday, March 12, 2008, 16:30–18:30, Poster C2
Redesign of the Göteborg Negative-Ion-Beam-Apparatus towards a test facility for laser photodetachment applications in AMS — •Christoph Diehl1, Anton Lindahl2, Pontus Andersson2, Oliver Forstner3, Walter Kutschera3, Dag Hanstorp2, and Klaus Wendt1 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz — 2Department of Physics, Göteborg University, SE-412 96 Göteborg — 3Institut fuer Isotopenforschung und Kernphysik, VERA-Laboratorium, Universität Wien, Währinger Strasse 17, A-1090 Wien
Negative ions are utilized in Accelerator Mass Spectrometry (AMS) on the low energy side of the tandem accelerator. A unique approach to further improve isobaric selectivity of AMS is to exploit the differences in the electron affinities of individual isobars by laser photodetachment. Laser radiation with energy above the photodetachment threshold of the unwanted isobar suppresses this species by selective neutralization, while leaving the wanted higher threshold isobar unaffected. This technique, called Laser Photodetachment Mass Spectrometry (LPMS), is presently refined at Göteborg University. For preparatory studies and subsequent employment on heavy molecules of interest, the ion beam apparatus was considerably optimized by a corresponding redesign. Using ion optical simulations, the transmission through the apparatus could be enhanced, while in parallel a higher mass resolution could be realized. These activities serve as preparatory steps towards separation of the interesting ultra trace isotope 182Hf from the disturbing isobar 182W using LPMS.