Abstract
Doubly excited ions have been obtained in one-electron capture processes by metastable ions from Cs (6s). Incident heliumlike ions have been prepared in high metastable fractions by collision in a gas cell of hydrogenlike ions produced by an ECR ion source. The main interest of this work was to find the electric-quadrupole transition 1s2s2p 4P°5/2–1s2p3d 4F°9/2 among the doubly excited quartet and doublet systems of 3-electron ions. Although E2 transitions are in principle highly forbidden, the 2s 4P°5/2–3d 4F°9/2 transition has been measured in N4+, O5+, F6+ and Ne7+ by vuv spectroscopy taking advantage of non-negligible branching ratios and highly-state-selective-collisions.
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