Heitler-London vs. Hartree-Fock

The H2-Molecule After the development of QM in 1925-26 (Heisenberg, Schrödinger, Born, Dirac), the Heitler-London treatment (1927) of the H2 molecule "opened the way to a theoretical understanding of chemical bonding".

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http://www.physik.uzh.ch/lectures/electroncorrelations/HF_vs_HF.pdf