Electron-impact-ionization measurements using hyperfine-assisted state 
preparation of ground-state berylliumlike sulfur

Hahn, M.; Bernhardt, D.; Grieser, Manfred; Krantz, Claude; Lestinsky, Michael; Müller, A.; Novotný, O.; Repnow, Roland; Schippers, S.; Wolf, Andreas; Savin, D.W.

doi:10.1103/PhysRevA.85.042713

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Electron-impact-ionization measurements using hyperfine-assisted state preparation of ground-state berylliumlike sulfur

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Grieser, Manfred
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Krantz, Claude
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Repnow, Roland
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Wolf, Andreas
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://link.aps.org/doi/10.1103/PhysRevA.85.042713
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Citation

Hahn, M., Bernhardt, D., Grieser, M., Krantz, C., Lestinsky, M., Müller, A., et al. (2012). Electron-impact-ionization measurements using hyperfine-assisted state preparation of ground-state berylliumlike sulfur. Physical Review. A, 85(4): 042713, pp. 1-4. doi:10.1103/PhysRevA.85.042713.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-9F0D-6

Abstract

We have measured electron impact ionization (EII) of the beryllium-like ion S¹²⁺. The use of an isotopically pure A=33 beam of S¹²⁺ ions is established as a method to eliminate all metastable levels, including the extremely long-lived metastable level 2s2p³ P₀, which, for this isotope, decays by hyperfine-induced radiative transitions. The energy dependence and absolute size of the EII cross section were measured from the resulting pure ground-state population at energies from below the threshold at ≈ 652.2 eV up to 3000 eV. These data provide an experimental benchmark for theory.