Abstract
We examine expectation values of p/sub 1/xp/sub 2/ in ground states of He and H/sup -/, the singly and doubly excited states of He, and the ground and low-lying valence states of the alkaline-earth-metal atoms. A simple commutator relation derived by Froese Fischer and Smentek-Mielczarek (J. Phys. B 16, 3479 (1983)) can be used to explain the sign and relative magnitudes of in the ground states of He and H/sup -/ and singly excited states of He. In the doubly excited states of He and in the ground and low-lying valence states of the alkaline-earth metals, the molecular model, which treats the electron--core-electron system as a floppy, linear triatomic ''molecule,'' correctly predicts signs and general trends for . These results represent an important test of the molecular model. The ability of this model to make intuitive predictions about quantities like is a strong confirmation of its validity and utility.
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