Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Experimental Techniques
MO 7.4: Vortrag
Montag, 11. März 2019, 14:45–15:00, S HS 002 Biologie
Autofragmentation of rovibrationally excited anionic metal dimers on hours time scale — •Jürgen Göck1, Arno Becker1, Klaus Blaum1, Christian Breitenfeldt1,2, Sebastian George1,2, Manfred Grieser1, Florian Grussie1, Robert von Hahn1, Philipp Herwig1, Jonas Karthein1, Claude Krantz1, Holger Kreckel1, Sunil Kumar1, Jorrit Lion1, Svenja Lohmann1, Christian Meyer1, Preeti M. Mishra1, Oldřich Novotný1, Aodh P. O’Connor1, Roland Repnow1, Kaija Spruck1,3, Stefan Schippers3, Lutz Schweikhard2, Stephen Vogel1, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik (MPIK), Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Institut für Physik, Ernst Moritz Arndt Universität Greifswald, 17487 Greifswald, Germany — 3I. Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
The tunneling dissociation of ro-vibrationally excited Ag2− and Co2− was studied for up to 1000 s in the Cryogenic Storage Ring (CSR) [1] at the MPIK. The cryogenic environment below 6 K leads to a residual gas pressure of less than 10−14 mbar (room-temperature equivalent)- ideal conditions for background-free gas-phase spectroscopy. The anions were produced in a metal-ion sputter source, accelerated up to 60 keV and stored in the CSR. The neutral and charged fragments of the reaction X2*− → X + X− were recorded by micro-channel-plate based detectors [2].The data include coincidence signals from autodissociation of the anions as function of the storage time. The observed non-exponential nature of the decay will be discussed.
[1] R. von Hahn et al., Rev. Sci. Instrum. 87, 063115 (2016)
[2] K. Spruck et al., Rev. Sci. Instrum. 86, 023303 (2015)