Ghost orbitals in semiempirical methods. Estimation of basis set superposition error

Abstract
Based on the all‐valence ZDO SCF approximation a procedure for estimating the basis set superposition error (BSSE) in semiempirical CNDO/INDO methods has been proposed. The results of the calculation show that the BSSE effect may improve the results obtained from the standard CNDO/INDO supermolecule calculation. The estimated BSSE effect enables one to explain some recently reported artificial structures for water and ethylene dimers.

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