Berlin 2001 – scientific programme
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A: Atomphysik
A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)
A 10.17: Poster
Wednesday, April 4, 2001, 12:30–15:00, AT3
Electron impact ionization of Ban+ ions — •H. Knopp1, C. Böhme1, J. Jacobi1, S. Ricz2, S. Schippers1, and A. Müller1 — 1Universität Giessen, Germany — 2ATOMKI Institute for Nuclear Research, Debrecen, Hungary
In the ionization of heavy ions the resonant excitation of a 3d electron leads to very highly excited states which can decay by multiple-autoionization processes. We studied these processes by observing resonance structures in multiple ionization cross sections for Ban+-ions with 1 ≤ n ≤ 13 in an energy range from about 600 to 1000 eV, depending on the ion charge state n. The measurements were carried out using an electron-ion crossed beams arrangement. Depending on the charge state n of the target ion up to sevenfold ionization was observed. The resonance strengths inferred from the measurements depend on n and the number of ejected electrons. A complete overview of measured cross sections for these processes will be given.