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The Coulson–Barnett expansion and a Taylor series in powers of cosθ for the off-center hydrogen 1s function are examined. Energy converges as L−4 in the former case and L−9/4 in the latter, where L is the expansion length. Other rates are found. The single-center integral Hellmann–Feynman method is briefly discussed. Radial-angular separation using a function of correct asymptotic behavior is also considered.
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Alfred B. Anderson (1971) studied this question.
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