The lifefimes of the (2p)2 P 3/2 level in Si XII and the (2p 2)3 P 2,1,0, (2s2p)1 P 1 and the (2p 2)1 D 2 levels in Si XI have been determined using the beam-foil method. It is proposed that existing discrepancies between experimental and theoretical f values for the (2s 2)1 S 0-(2s2p)1 P 1 transition in some ions of the Be sequence may be the result of the inability of the experimentalist to account for strong cascading from the (2p 2)1 S 0 level.

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