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Zusammenfassung:
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.
