Biradicaloids nonsymmetric

So far, the preceding considerations have been very useful for characterization of states and for ordering of singlet-state energies relative to (T) with fixed values of K and K. Nevertheless, we could not receive any qualitative ideas about the shapes of energy surfaces as the biradicaloids develop from the normal molecules. For this purpose the introduction of overlap, which we have neglected so far, is necessary. The Hamiltonian matrix for nonorthogonal orbitals A and B for nonsymmetric biradicaloid is... 

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