Darmstadt 2008 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Poster

MS 9.1: Poster

Mittwoch, 12. März 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.