Abstract
The Hylleraas-Scherr-Knight variation-perturbation method is applied to the calculation of oscillator strengths for the dominant transitions from the metastable $2p3p^{3}P$ and $2p3d^{1,3}D$ states of helium and the heliumlike ions. The results explain the absence of the $1s2p^{3}P\ensuremath{-}2p3p^{3}P$ transition of He i from recent beam-foil excitation spectra.
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