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• W4293493812 abstract "Methods for correcting residual energy errors of configuration interaction (CI) calculations of molecules and other electronic systems are discussed based on the assumption that the energy defect can be mapped onto atomic regions. The methods do not consider the detailed nature of excitations but instead define a defect energy per electron that is unique to a specific atom. Defect energy contributions are determined from calculations on diatomic and hydride molecules and then applied to other systems. Calculated energies are compared with experimental thermodynamic and spectroscopic data for a set of 41 mainly organic molecules representing a wide range of bonding environments. The most stringent test is based on a severely truncated virtual space in which higher spherical harmonic basis functions are removed. The errors of the initial CI calculations are large, but in each case, including defect corrections brings calculated CI energies into agreement with experimental values. The method is also applied to a NIST compilation of coupled cluster calculations that employ a larger basis set and no truncation of the virtual space. The corrections show excellent consistency with total energies in very good agreement with experimental values. An extension of the method is applied to dmsn states of Sc, Ti, V, Mn, Cr, Fe, Co, Ni, and Cu, significantly improving the agreement of calculated transition energies with spectroscopic values." @default.
• W4293493812 created "2022-08-29" @default.
• W4293493812 creator A5045012255 @default.
• W4293493812 date "2022-09-22" @default.
• W4293493812 modified "2023-09-29" @default.
• W4293493812 title "Correction of residual errors in configuration interaction electronic structure calculations" @default.
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• W4293493812 doi "https://doi.org/10.1063/5.0098793" @default.
• W4293493812 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36182438" @default.
• W4293493812 hasPublicationYear "2022" @default.
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