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Absolute measurements have been made of cross sections for the ionisation of Li2+ ions by electrons with energies which range from threshold (122.45 eV) to 1000 eV. The results are in good agreement with available distorted-wave exchange calculations. The scaling behaviour of ionisation cross sections along the hydrogen isoelectronic sequence is discussed.11 This work contains parts of K Tinschert's thesis, Giessen D26.

Absolute cross sections have been measured for electron-impact ionization of Fe ions of initial charges 5+, 6+, and 9+ from below' threshold to 1500-eV collision energies. Distorted-eave calculations including only direct ionization from ground-state ions underestimate the measured peak cross sections by 60 -70% due to the effects of metastable states and contributions of excitation autoionization to the total cross sections. Ionization rate coefficients and fitting parameters are presented for this data and for Fe+ and Fe~+.