Variational calculations using Hylleraas coordinates have been performed for the first time for estimating the energies of 3dnf(Do1,3) state of helium for n=4,5,6. We predict absorption peaks at 12.219, 12.647, and 12.857eV for the Do3 series converging to N=3 ionization threshold of He+ which can be expected to be observed in the experiment of single photon double excitation of lowest Pe3 state of helium placed in synchrotron radiation.

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