Floating Spherical Gaussian Orbital Model of Molecular Structure. VI. Double-Gaussian Modification

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Abstract
The floating spherical gaussian orbital model is modified to improve molecular energies and geometry by using a linear combination of two concentric spherical Gaussian orbitals (a double Gaussian) as the localized orbital. The double‐Gaussian model was applied to hydrogen, the first‐row atom hydrides, and a series of hydrocarbons. Bond lengths are predicted within 5.8% and bond angles within 6.6% for all the cases investigated. Molecular energies are generally 96% of Hartree–Fock values, and bond angles are improved.