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The conventional extremely simplified form of the Heitler-London theory is applied to the energy levels of the molecules BH, CH, NH, OH, FH. The exchange integrals, determined empirically to make the theory fit the known levels, are found to vary slowly and regularly from one molecule to the next. The energies of states as yet unobserved are predicted.
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J. R. Stehn (1937) studied this question.
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