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

Hahn, Michael; Bernhardt, D.; Grieser, M.; Krantz, C.; Lestinsky, M.; Muller, A.; Novotny, Oldrich; Repnow, R.; Schippers, S.; Wolf, A.; Savin, Daniel Wolf

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 2s2p 3 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.

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Astrophysics Laboratory
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April 4, 2018

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Corresponding publication: Electron-impact-ionization measurements using hyperfine-assisted state preparation of ground-state berylliumlike sulfur. M. Hahn, D. Bernhardt, M. Grieser, C. Krantz, M. Lestinsky, A. Müller, O. Novotny, R. Repnow, S. Schippers, A. Wolf, and D. W. Savin. PRA 85, 042713 (2012). View in Academic Commons at https://doi.org/10.7916/D8P277Z1