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The ls2s2p 4P0 - 1s2p2 4P transitions of Si XII have been investigated using fast ion beam spectroscopy in the far ultraviolet. The results for fine structure intervals and term separation represent the highest Z test of electron correlation effects and relativistic contributions in doubly excited states of lithiumlike ions

FINE STRUCTURE OF THE 1s2s2p 4P0 AND 1s2p2 4P DOUBLY EXCITED STATES OF LITHIUMLIKE Si XII

FINE STRUCTURE OF THE 1s2s2p ⁴P⁰ AND 1s2p² ⁴P DOUBLY EXCITED STATES OF LITHIUMLIKE Si XII