Comparisons of experimental and theoretical Stark profiles of the allowed 2 1 P-3 1 D helium line at 6678AA and of the forbidden 2 1 P-3 1 P component at 6632AA in a dense plasma were carried out. The plasma was produced by optical breakdown of helium by means of a repetitive, high power CO 2 laser. The allowed line shows good agreement with conventional theory, but discrepancies are found around the centre of the forbidden component. When normally neglected ion motions are taken into consideration, the observed discrepancies are partially removed. Tables of the Stark profiles for the pair of lines are given for electron densities in the range 3*10 15 -3*10 17 cm -3 and temperatures in the range 10000-40000K.
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Yaakobi et al. (1972) studied this question.
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