Freiburg 2024 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 4: Poster
MS 4.9: Poster
Tuesday, March 12, 2024, 17:00–19:00, Aula Foyer
Progress Update on the ELISE Project at FSU Jena: Optimizing Negative Ion Supression for AMS through Laser Techniques — •Shiva Prasad Pulipati1, Oliver Forstner1, Klaus Wendt2, and Thorben Niemeyer2 — 1Friedrich-Schiller-Universität Jena — 2Gutenberg-Universität Mainz
The Extended Laser Isobar Separator (ELISE)@IBC project, is currently in the construction phase at FSU Jena. Our current work focuses on constructing a negative ion source test setup for ELISE and emphasizes the process of negative ion suppression through laser-assisted techniques. Our goal is to significantly improve the isotopic measurements concerning abundance sensitivity by highly selective AMS (accelerator mass spectrometer) techniques by further orders of magnitude without altering the state-of-the-art Cs sputter ion sources. This contribution provides a progress update on our ongoing investigations on the intricate relationship between laser radiation and negative ions at the low energy side of an AMS. Our primary objective is to leverage laser technology for the selective enhancement or suppression of specific negative ion species already during or immediately after production in the ion source, thereby enhancing the sensitivity of isotopic measurements considerably.Our efforts include the meticulous characterization of laser parameters influencing ion suppression and the testing of an ion cooler system designed to slow down negative ions to thermal energies, ensuring long-term overlap with a laser beam. Careful tuning of laser frequency and power for the photodetachment process will allow for optimum suppression of elemental and molecular contaminations.
Keywords: Laser techniques; ion supression