The floating spherical Gaussian orbital (FSGO) model is applied to the He and Be atom isoelectronic sequences and to the molecules and ions: H2, He2+ +, HeH+, H3+, H4+ +, HeH−, LiH, and BeH+. Bond lengths are predicted generally to within 5% of accurate values. The He–He repulsive interaction is also calculated.
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Arthur A. Frost (1967) studied this question.
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