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2016 ; 12
(3
): 1082-96
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Semiempirical Quantum-Chemical Orthogonalization-Corrected Methods: Theory,
Implementation, and Parameters
#MMPMID26771204
Dral PO
; Wu X
; Spörkel L
; Koslowski A
; Weber W
; Steiger R
; Scholten M
; Thiel W
J Chem Theory Comput
2016[Mar]; 12
(3
): 1082-96
PMID26771204
show ga
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.