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A: Atomphysik

A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)

A 10.17: Poster

Mittwoch, 4. April 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.