A calculation of the energy and various expectation values of the 1 1 S, 2 1.3 S and 2 1.3 P states of helium using perturbation theory is described. The method is based on zero order wavefunctions generated by the frozen core Hartree-Fock approximation. To fourth order in the energy and second order in the wavefunctions excellent agreement with the calculations of Pekeris is obtained.
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Devine et al. (1972) studied this question.
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