Abstract
Doubly excited states of atoms have now been studied for twenty years. The simultaneous excitation of two electrons from the ground state of an atom (or ion) leads to phenomena qualitatively different from those exhibited by single excitation. New basis states, new models and new quantum numbers are required to describe some of these phenomena. Broad-ly, all two electron states can be divided into two classes, those in which single particle behavior dominates and those which have to be considered throughout in terms of the electron pair. This distinction, the basic differences in the two types of states, the attendant implications for their experimental observation, and the broader setting of this study of the quantum mechanics of strongly perturbed or non-separable potentials are discussed.
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