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MS: Fachverband Massenspektrometrie
MS 1: Accelerator Mass Spectrometry and Applications
MS 1.2: Vortrag
Montag, 11. März 2019, 11:00–11:15, U A-Esch 2
Cs isotope measurements by means of ILIAMS — •Johannes Lachner1, Alexander Wieser1, Dag Hanstorp2, Maki Honda1, Haimei Liang2, Di Lu2, Oscar Marchhart1, Martin Martschini1, Alfred Priller1, Peter Steier1, Julia Sundberg2, Jakob Welander2, and Robin Golser1 — 1Isotope Physics, Faculty of Physics, University of Vienna, Austria — 2Department of Physics, University of Gothenburg, Sweden
The sensitive analysis of the trace isotopes 135,137Cs in natural samples, which is of interest for environmental and radio-ecological studies, is one of the aims in the development of Ion Laser InterAction Mass Spectrometry (ILIAMS) at the Vienna Environmental Research Accelerator (VERA). Following the extraction of CsF2− and BaF2− from the sputter ion source, a suppression of the 135,137Ba isobars can be accomplished using a combination of 1) collisional detachment in a He buffer gas filled radiofrequency quadrupole, 2) chemical reactions by admixing a small fraction of O2 to the He buffer gas, and 3) photodetachment with 2.3 eV photons (λ=532 nm).
Experiments at the Göteborg University Negative Ion Laser LAboratory (GUNILLA) suggest that increasing the photon energy from 2.3 eV to 3.8 eV or 5.0 eV is not applicable since both CsF2− and BaF2− are detached at higher energies. On the other hand, the experiments revealed that the interfering isobar BaF2− is easier detached in collisions than CsF2−. First ILIAMS assisted AMS measurements at VERA resulted in the successful detection of 135Cs and 137Cs using in-house reference materials.