The FSGO method which, in its simple form, assigns electrons in pairs to orbitals represented by single Gaussian functions, is extended here in two ways: (1) to an open-shell treatment in which a single determinant is used; (2) to an open-shell treatment in which several determinants are used so that the wave function is an eigenfunction of the S2 operator. Formulae are given.
A. H. Pakiari and J. W. Linnett, J. Chem. Soc., Faraday Trans. 2, 1976, 72, 641 DOI: 10.1039/F29767200641
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