Valence Bond Output for the HF Molecule

The RLcov ion is simply twice the SE term, that is 7.6 kcal/mol. 

the overlap matrix between the structures is called matrix of overlap , and is followed by matrix of hamiltonian . It can be seen that the overlap integrals between the VB structures are smaller than in the H2 example, 

Wei Wu, Lingchun Song, Yirong Mo, and Qianer Zhang, XIAMEN -- An Ab Initio Spin-free Valence Bond Program, Department of Chemistry, The State Key Laboratory for Physical Chemistry of Solid Surfaces, and Institute of Physical Chemistry, Xiamen University, Xiamen, 361005, 

OPTIMIZATION METHOD DFP WITH FORWARD-DIFFERENCE Number of Structures 3 

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