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A simple perturbation method is suggested for the calculation of energies of the states of homonuclear molecules at large internuclear distances R for which the identity of the nuclear fields must be taken into account, a comparison with exact data on the 1sσg and 2pσu states of H2+ showing that results of high accuracy can be obtained without undue labour. The method is also applied to the 1Σg and 3Σu states of H2 and reasons are advanced for supposing that the results are, at least for R greater than 4a0, more accurate than those of any previous calculation.
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Dalgarno et al. (1956) studied this question.
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