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The long-range interaction energy between two normal hydrogen atoms has been calculated directly, without recourse to laborious variational methods. The result E 2 ( R ) = -12 998 R -6 -248.80 R -8 -6571 R -10 -... confirms that of Chan and Dalgarno as opposed to that of Hirschfelder and Löwdin.
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R. J. Bell (1965) studied this question.
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