Abstract
We have reviewed the cross-section data of electron impact excitation for transitions starting from the ground and metastable states, and for those between different − l levels within the same n for neutral helium. We have taken into account the effect of the helium singlet and triplet wave function mixing caused mainly by the spin-orbit interaction. The dependence of the degree of the mixing on the magnetic field strength was also calculated. We have incorporated these data in our collisional-radiative model code and analysed the population of the 3 3 P and 3 3 D levels measured in the WT-3 tokamak plasma. The ground and 2 3 S metastable state populations thus determined are compared with those given by the neutral transport code.
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