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MS: Fachverband Massenspektrometrie
MS 4: Application to Astrophysics
MS 4.2: Vortrag
Dienstag, 11. März 2025, 16:15–16:30, HS 2 Chemie
Using metastable C− ions to infer limits on room temperature radiation in the Cryogenic Storage Ring — •Mira Newe, Manfred Grieser, Florian Grussie, Oldřich Novotný, Viviane C. Schmidt, Aigars Znotiņš, and Holger Kreckel — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
In order to investigate molecular processes of astrophysical relevance the Cryogenic Storage Ring (CSR) is operated at very low temperatures (∼4 K). In this low black-body radiation field molecules can cool to their lowest rotational states. Nevertheless, small radiation leaks, as e.g. by laser viewports or beamline ports, lead to a slightly elevated radiation field with a small room temperature component [1]. For future experiments and new detector developments it is important to quantify this room temperature component.
To probe the room temperature contribution we measured the lifetime of metastable C− anions in the highly excited 2D states, which can be photodetached by room temperature radiation. Using the method of laser probing we measured the radiation-limited lifetime of the metastable ions at cryogenic temperatures. Corresponding measurements were also made at room temperature (without laser probing) to verify previous results [2]. The results and implications will be presented and discussed.
[1] C. Meyer et al., Phys. Rev. Lett. 119, 02320 (2017)
[2]T. Takao et al., J. Phys. Conf. Ser. 88, 012044, (2007)
Keywords: Storage Ring; Negative Ions; Metastable States