Freiburg 2024 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Precision Mass Spectrometry

MS 1.7: Vortrag

Montag, 11. März 2024, 12:45–13:00, HS 3042

Analyzing a 30-year-old thorium foil with MR-ToF mass spectrometry — •Paul Fischer¹, Jonas Stricker^2,3, Dennis Renisch^2,3, Christoph Düllmann^2,3,4, and Lutz Schweikhard¹ — ¹Inst. f. Physik, Universität Greifswald, Germany — ²Department Chemie, Johannes Gutenberg-Universität Mainz, Germany — ³Helmholtz-Institut Mainz, Germany — ⁴GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

A foil of ²³²Th produced roughly thirty years ago is investigated by high-vacuum laser-ablation and multi-reflection time-of-flight (MR-ToF) mass analysis. Cat- and anions are identified by precision mass measurements: By storing ions of interest between two opposing electrostatic mirrors, their flight time is increased, leading to mass resolving powers on the order of 100,000 and a corresponding rise in mass-measurement accuracy.

A number of thorium-monomer- and thorium-dimer-based molecules including carbon, nitrogen, oxygen, or fluorine atoms are found. Additionally, a small uranium contamination is observed, leading to compound molecules incorporating both Th and U. Selected species are excited with a 532-nm laser pulse to probe their photodissociation behavior and determine relative fragment abundances.

Keywords: multi-reflection time-of-flight mass spectrometry; MR-ToF; thorium; photodissociation