Application of the multiconfiguration energy bound method to the Feshback-type1,3Peautoionization states of He

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Abstract
The multiconfiguration energy bound procedure has been applied to Feshbach-type autoionization states with the 1.3Pe symmetries of He. The calculations were performed in connection with an investigation of a possible extension of the MCEB procedure to include also the nonphysical intersections of roots originally belonging to different thresholds. The resulting curves exhibit only single minima. The nonrelativistic energies are given for some of the lowest lying states of both symmetries pertaining to the n=3 and n=4 thresholds. The correct identification of the various curves is facilitated by the computed contributions to the total wavefunction from the different types of configurations.