Köln 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MS: Fachverband Massenspektrometrie
MS 6: Isobar Suppression Techniques
MS 6.5: Vortrag
Donnerstag, 13. März 2025, 12:15–12:30, HS 2 Chemie
Photodetachment measurements of negatively charged molecules and element separation at VERA — •T. Niemeyer1, S. Berndt1, Ch. E. Düllmann1,2,3, O. Forstner4,5, K. Hain6, R. Hasse1, K. Hens7, M. Martschini6, S. Merchel6, M. Stemmler8, and K. Wendt1 — 1Johannes Gutenberg-Universität Mainz — 2Helmholtz-Institut Mainz — 3GSI Darmstadt — 4Friedrich-Schiller-Universität Jena — 5Helmholtz-Institut Jena — 6Universität Wien — 7Hübner GmbH & Co. KG, Division HÜBNER Photonics, Kassel — 8Institut für Radioökologie und Strahlenschutz (IRS), Leibniz Universität Hannover
Detection limits of 16 orders of magnitude in isotope ratios and isobaric suppression make Acccelerator Mass Spectrometry (AMS) the method of choice for ultra-sensitive trace analysis in various fields such as radiometric dating, nuclear astrophysics and geology. However, isobaric interferences still challenge ultrarare isotope measurements, e.g., of Mn-53 which is used for long-term geological and extraterrestrial dating or Fe-60 as an indication of supernovae remains found on Earth.
To suppress interfering isobar anions such as CrO on mass 53, tunable light sources, based on Ti:Sa and OPO technology, were used for the first time at the ILIAMS cooler at the low-energy side of the VERA AMS facility at the University of Vienna. Here we report on measurement of laser photodetachment curves for various oxide anions such as FeO, NiO, MnO, CrO and TiO, delivering useful molecular physics data as well as predictions on the expected isobaric suppression of e.g. MnO against CrO for AMS applications.
Keywords: AMS; Photodetachment; Oxide anions