Abstract
The doubly-excited He-** resonances observed near the He(1s3l 3,1L) thresholds are analysed, using the adiabatic hyperspherical formalism for two active atomic electrons. The non-Coulombic He+(1s) core perturbs the motion of the outer electron pair only slightly. In spite of state-dependent shifts of the doubly excited energy levels of He-** induced by core interaction, the wavefunctions of the two outer electrons of He-** display correlation patterns very similar to these found in H-**. This correspondence allows a rovibrational classification of the doubly-excited He-** resonances and suggests a similarity between the H-** and He-** decay widths. The study gives theoretical support to the grandparent model and a general framework for a variational treatment of doubly-excited states with a structural atomic core.
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