Abstract
We report studies of double-electron transfer in slow collisions ({ital v}{approx}0.2--0.4 a.u.) of the F-like (nine-electron) ions Si{sup 5+}, Ar{sup 9+},Sc{sup 12+}, Ti{sup 13+}, Fe{sup 17+}, and Cu{sup 20+} with He atoms. The transfer populates doubly excited states of the Na sequence (eleven electrons) of these elements that we study via the subsequent electron emission using high-resolution Auger spectroscopic techniques. Comparison is made to spectra that are formed by single-electron capture by Ne-like (ten-electron) ions in the 2{ital p}{sup 5}3{ital s} {sup 3}{ital P}{sub 0,2} metastable levels. Non-Coulomb (Breit interaction) Auger decay of the Na-like metastable level 2{ital p}{sup 5}3{ital s}3{ital p} {sup 4}{ital D}{sub 7/2} forms a prominent line in many of these spectra.
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