Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 17: Collisions, scattering and correlation phenomena
A 17.3: Talk
Wednesday, March 16, 2022, 14:45–15:00, A-H1
First experimental results on electron-impact ionisation of La1+ with a new energy-scan systems — •B. Michel Döhring1,2, Alexander Borovik Jr1, Kurt Huber1, Alfred Müller1, and Stefan Schippers1 — 1Justus-Liebig-Universität Gießen — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
For the investigation of resonance structures in electron-impact ionisation cross sections one needs to be able to scan these cross sections in small electron-energy steps. In order to meet this requirement we have developed a new fast energy-scan system for a new recently commissioned high-power electron gun [1]. This new gun extends the range of experimentally available electron energies from previously 1 keV [2] to now 3.5 keV. As compared to the old gun, the new one has more electrodes. This enables us to more flexibly control the transport of the electron beam. However, this also required a completely new development of the scanning system. We will report on first experimental results on single and multiple ionisation of La1+ ions. The new data compare well with earlier measurements [3] and extend the known energy range by a factor of two.
[1] A. Müller et al., 1988 Phys. Rev. Lett. 61 70.
[2] B. Ebinger et al., 2017 Nucl. Instrum. Meth. B 408 317.
[3] A. Müller et al., 1989 Phys. Rev. A 40 3584.