Abstract
Experimental cross sections for single and double ionization of ${\mathrm{Ba}}^{2+}$ and ${\mathrm{Ba}}^{3+}$ ions are presented for an electron-impact energy range from threshold up to 1000 eV. By the alternative use of a ``hot'' electron-cyclotron-resonance ion source and a ``cold'' Penning ion source, beams of ions with and without metastable content could be employed. A fast energy-scanning technique with step widths of about 40 meV and an energy resolution of 0.4 eV revealed fine details in the cross sections, and in particular resonant contributions to single and double ionization could be observed. The data are interpreted on the basis of calculations of energy levels and distorted-wave calculations of direct ionization from various electron subshells. Influences of giant-resonance phenomena are discussed.
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