Abstract
The authors present in graphical form (Z-diagrams) an extension, to nuclear charges Z(2, of previous study on doubly excited 1Se states of helium-like systems. The structure of the diagrams and closed-channel wavefunctions are discussed from the viewpoint of the quantum defect expression, which is coherent with an independent electron picture. The analysis also contributes to a better understanding of the H- resonances. To apply to the complete Z- correlation diagram, the (N, n alpha ) and (K, T) notation may be taken as equivalent, except in pseudocrossing regions where both labelling schemes break down. Energy ordering together with Z-diagrams provide the only general classification of doubly excited states.
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