Calculations
GVB code in some programs, particularly GAMESS (US), can also be used to do a variety of restricted open-shell Hartree-Fock calculations, such as those with one or three electrons in two pi-electron molecular orbitals while retaining the degeneracy of the orbitals. This wave function is essentially a two-determinant function, rather than the one-determinant function of the restricted Hartree-Fock method.
Read more about this topic: Generalized Valence Bond
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