Abstract
The calculations of the energies of the singlet doubly excited states 2p2 1D, 3d2 1G, 4f2 1I of helium-like systems we have done in our previous paper [Biaye et al, Eur. Phys. J. D 13 21 (2001)] are extended to the other singlet doubly excited (nl)2 states with n ≤ 4. The energies are calculated in the framework of the variation method by using some special forms of Hylleraas-type wave functions with a real Hamiltonian. The results which we have obtained are in good agreement with some experimental data and other theoretical results.
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