Radiative Decay of Autoionizing np 2-States During Dielectronic Recombination of Zn+ and Cd+ Ions
Dielectronic recombination of Zn+ and Cd+ ions involving electron excitation of the ion ns core with simultaneous resonance capture of an incident electron into the doubly-excited intermediate autoionizing np2 1S0-state followed by its radiative stabilization np2 → nsnp + hν was observed and investigated using an ultrahigh-vacuum apparatus with crossed electron and ion beams. The effective cross sections of dielectronic recombination at the maximum were 0.9·10–17 cm2 for Zn+ and 1.6·10–17 cm2 for Cd+, which were comparable with those for electron excitation of the resonance lines of the studied ions. The high probability of radiative decay of the autoionizing np2 1S0-state was due to relativistic and correlation effects.
Keywordsautoionizing state dielectronic recombination effective cross section
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