Transitions in Multiply Excited FVI and FVII

The transitions 1 s 2 s 2 p 2 5 P -1 s 2 p 3 5 S 0 in F VI and 1 s 2 s 2 p 4 P 0 -1 s 2 p 2 4 P in F VII have been investigated using the method of beam-foil spectroscopy. The fine-structure separations have been determined for the 1 s 2 s 2 p 2 5 P term in F VI and for both 4 P terms in F VII. The results are compared with recent theoretical calculations of fine structure, based on relativistic wavefunctions, and with previous experimental data. Lifetime measurements are reported for the 1 s 2 p 2 4 P 5/2 level and the 1 s 2 p 3 5 S 2 0 level.