The SD BOVB method

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Definition of the S-BOVB level

The "S" in the name means "splitted". At this level, in each VB structure, all the active orbitals which are doubly occupied at the L-BOVB level are "splitted", that is to say they are replaced by a pair of singlet-coupled electrons in two different orbitals located on the same center. Here is below a pictorial example for the F^-F⁺ ionic structure of difluorine dimer. This allows the inclusion of some more dynamical correlation (radial correlation) for the active electron pairs.

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