We have searched for radiative transitions from doubly excited levels in He I, using the beam-foil method. The spectra showed the 1s2p³P-2p²³P transition at 320. 4 {} and some weaker lines, which are also interpreted as transitions from the doubly excited system. Radiative lifetimes were measured for three lines. Our value for the 2p²³P level, 0.080 ±{} 0.007 nsec, is in agreement with the recent theoretical value of 0.0803 nsec. The possibilities of observing transitions from doubly excited levels in the He I isoelectronic sequence are briefly discussed.
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Berry et al. (1971) studied this question.
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