A double perturbation theory for molecul
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E. Beretta; F. Vetrano
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Article
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1973
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John Wiley and Sons
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English
β 454 KB
## Abstract Consideration is given to the problem of interactions between molecular systems (magnetic couplings being neglected) by highlighting the fact that the main difficulty of a perturbation theory that takes into account the exchange effects, resides in the differentiated symmetry of the unp