Hannover 2020 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 2: Storage Rings
MS 2.3: Talk
Monday, March 9, 2020, 14:45–15:00, f128
Metastable states of the silicon anion observed in a cryogenic storage ring — •D. Müll1, K. Blaum1, S. George1,2, M. Grieser1, F. Grussie1, E.A. Guerin1, J. Göck1, R. von Hahn1, N. Jain1, Á. Kálosi1, C. Krantz1, H. Kreckel1, O. Novotný1, F. Nuesslein1, D. Paul1, S. Saurabh1, C. Schumacher1, V. Schmidt1, S. Sunil Kumar1, X. Urbain3, P. Wilhelm1, A. Wolf1, and A. Znotins1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, Germany — 3Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
We have used the Cryogenic Storage Ring (CSR) at the Max Planck Institute for Nuclear Physics to study the metastable states of the silicon anion. We stored fast Si− ions (58 keV kinetic energy) in the ultra-high cryogenic vacuum of the CSR, using only electrostatic deflection elements. We used several continuous wave laser systems at 633 nm, 980 nm, 1064 nm, 1390 nm and 2700 nm as well as a tunable pulsed optical parametric oscillator to obtain information about the decay of the metastable anionic states by selective photodetachment. Our data shows evidence for the existence of an extremely long-lived metastable state with a lifetime of several hours and of another very weakly-bound metastable state with a lifetime of around 20 s. We compare our results to state-of-the-art calculations of Si− metastable lifetimes, which show considerable differences in the predicted time constants.