By using a photon-ion merging-beam apparatus, the relative photoion-yield spectra for Sr 2+ and Sr 3+ from Sr + ions in the ground state were measured around the 3d-ionization region. In the Sr 3+ -yield spectrum, some discrete lines are observed and a broad structure which reflects the giant resonance corresponding to the 3d- epsilon f transition is found. The observed spectra were analysed with the results of a multiconfiguration Dirac-Fock calculation code. The computation reveals that the observed discrete lines are composed of many lines which have a character due to the strong 5s-4d mixing effect. This is understood from the fact that after the 3d-hole creation, the final 4d-wavefunction collapses and its orbital energy sits beneath that of the 5s orbital.
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Itoh et al. (1995) studied this question.
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