Rostock 2019 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 3: Mass Spectrometry - Posters
MS 3.14: Poster
Dienstag, 12. März 2019, 16:30–18:15, S Fobau Physik
Metastable states of the silicon anion observed in a cryogenic storage ring — •D. Müll1, F. Grussie1, E. A. Guerin1, A. Becker1, K. Blaum1, C. Breitenfeldt1,2, S. George1,2, J. Göck1, M. Grieser1, R. von Hahn1, P. Herwig1, J. Hörl1, Á. Kálosi3, J. Karthein1, C. Krantz1, H. Kreckel1, S. Lohmann1, C. Meyer1, P. M. Mishra1, O. Novotný1, A. P. O’Connor1, D. Paul1, R. Repnow1, S. Saurabh1, K. Spruck1, S. Sunil Kumar1, X. Urbain4, S. Vogel1, P. Wilhelm1, and A. Wolf1 — 1Max-Planck Institut für Kernphysik, Heidelberg, Germany — 2Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, Germany — 3visitor from Charles University Prague, Czech Republic — 4Institute 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. To this end we have stored a fast (58 keV) Si- beam in the near-perfect cryogenic vacuum of the CSR, using only electrostatic deflection elements. We used several continuous laser systems at 633 nm, 980 nm, 1064 nm and 1390 nm, as well as a tunable pulsed optical parametric oscillator, in order to obtain information about the decay of the metastable anionic states by selective photodetachment. As a result, we show evidence for the existence of an extremely long-lived metastable state with a lifetime of several hours. We also found indication of another metastable state with a lifetime on the order of 20 s, in agreement with theoretical predictions.