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MO: Fachverband Molekülphysik
MO 21: Astrophysics and Ions
MO 21.6: Vortrag
Freitag, 13. März 2020, 15:30–15:45, f142
Delayed electron detachment and fragmentation of laser-excited Al4− clusters — •Felix Nuesslein1, Klaus Blaum1, Paul Fischer2, Sebastian George2, Jürgen Göck1, Manfred Grieser1, Robert von Hahn1, Oded Heber3, Ábel Kálosi1, Stav Knaffo4, Michael Lembach5, Yannick Mees5, Damian Müll1, Gereon Niedner-Schatteburg5, Oldřich Novotný1, Daniel Paul1, Hilel Rubinstein3, Sunny Saurabh1, Viviane C. Schmidt1, Lutz Schweikhard2, Raj Singh3, Yoni Toker4, Patrick Wilhelm1, Andreas Wolf1, and Yitzhak Yonas4 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Universität Greifswald, Institut für Physik, 17487 Greifswald, Germany — 3Weizmann Institute of Science, 76100 Rehovot, Israel — 4Bar-Ilan University, 5290002 Ramat-Gan, Israel — 5Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
The Delayed Electron Detachment (DED) and fragmentation of Al4− ions were studied in the Heidelberg electrostatic Cryogenic Storage Ring (CSR) [1] by merging nanosecond OPO laser pulses with the stored Al4− ion beam in one of the four ∼2.6 m linear, field-free experimental sections. Up to 600 µs after a laser pulse, neutrals due to electron detachment were detected downstream with a MicroChannel Plate (MCP) detector. With a second, movable MCP detector, we observed prompt and delayed fragment events on a 300 µs timescale. To examine DED near the Adiabatic Electron Affinity (AEA∼2.2 eV) of Al4−, we varied the photon energy in 5 meV steps from 1.8–2.3 eV. For up to 65 s, cooling of the ions in the extremely low blackbody radiation field of CSR (Teff∼15 K [2]) was observed. The studies yield insight into the cooling and AEA of the Al4− clusters.
[1] von Hahn et al., Rev. Sci. Instrum. 87, 063115 (2016)
[2] Meyer et al., Phys. Rev. Lett. 119, 023202 (2017)