The photoelectron effect; Koopman's theorem; the argon atom; the nitrogen molecule; the correlation of AH2 molecules: Hydrogen sulfide and water; MO models for larger molecules; pi conjunction in butadiene; bond-bond interaction in polysilanes; perturbation of benzene pi system by methylio substituents; "Through space" interactions in isopropylidene norboradiene; "Through bond" interaction in diazabicyclo [2.2.2.]octane.
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Bock et al. (1974) studied this question.