Abstract
A new perturbative method is applied to single bonds. The starting model is the second-quantized self-consistent Heitler-London model. The unperturbed function is a four-determinant Bardeen-Cooper-Schrieffer function. Perturbative corrections are computed with renormalized Feynman diagrams. Convergence is satisfactory by third order. Calculated (experimental) dissociation energies in eV are 4.61 (4.75) for H 2 , 2.37 (2.52) for LiH, 6.22 (6.13) for FH, and 1.88 (1.66) for F 2 . Calculated (experimental) equilibrium bond distances in A are 0.739 (0.741) for H 2 , 1.598 (1.596) for LiH, 0.903 (0.917) for FH, and 1.395 (1.412) for F 2
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