A calculation of optical dipole transition oscillator strengths between the 1 1S, 2 1,3S, 2 1,3P, 3 1,3S, 3 1,3P and 3 1,3D states of helium using perturbation theory is described. The method is based on zero order wavefunctions generated by the frozen core Hartree-Fock approximation. The results to second order are in excellent agreement with the values calculated by Pekeris and co-workers.
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Devine et al. (1972) studied this question.
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