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The NDDO Approximation
The Neglect of Diatomic Differential Overlap is the next level of approximations used in semiempirical quantum chemistry and the basis of...
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The INDO Scheme
The next extension in semiempirical MO theory come with the introduction of the intermediate neglect of differential overlap (INDO)...
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Zero Differential Overlap and the CNDO Methods
The next advent in semiempirical methods comes with the introduction of the zero differential overlap approximation, which states that...
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Extended Hueckel
Perhaps the first semiempirical method worth exploring is the extended Hueckel, the generalisation of the Hueckel method for systems as...
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Introduction
Hartree-Fock (HF) theory belongs to a class of methods coined ab initio, because all molecular integrals that are required are...
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