Abstract
Stark broadening of quasidegenerate He lines at λ = 447 nm and 492 nm hasbeen investigated at low electron densities ( N e = 10 21 and 3 x 10 21 m -3). The perturber mass was varied by using H +, He + and Ar + ions. Variation of the parameter ( T 0 /μ) 1/2 by a factor of 3 is accompanied by marked ion-dynamical effects in the forbidden component. The results are compared with calculations according to the unified theory and the model microfield method. Characteristic deviations are observed and critically discussed.
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