Dral PO, Wu X, Spörkel L, Koslowski A, Weber W, Steiger R, Scholten M, Thiel W. Semiempirical Quantum-Chemical Orthogonalization-Corrected Methods: Theory, Implementation, and Parameters.
J Chem Theory Comput 2016;
12:1082-96. [PMID:
26771204 PMCID:
PMC4785507 DOI:
10.1021/acs.jctc.5b01046]
[Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Semiempirical orthogonalization-corrected
methods (OM1, OM2, and
OM3) go beyond the standard MNDO model by explicitly including additional
interactions into the Fock matrix in an approximate manner (Pauli
repulsion, penetration effects, and core–valence interactions),
which yields systematic improvements both for ground-state and excited-state
properties. In this Article, we describe the underlying theoretical
formalism of the OMx methods and their implementation
in full detail, and we report all relevant OMx parameters
for hydrogen, carbon, nitrogen, oxygen, and fluorine. For a standard
set of mostly organic molecules commonly used in semiempirical method
development, the OMx results are found to be superior
to those from standard MNDO-type methods. Parametrized Grimme-type
dispersion corrections can be added to OM2 and OM3 energies to provide
a realistic treatment of noncovalent interaction energies, as demonstrated
for the complexes in the S22 and S66×8 test sets.
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