Semiempirical Quantum-Chemical Orthogonalization-Corrected Methods: Theory, Implementation, and Parameters

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• 作者：Pavlo O. Dral ; Xin Wu ; Lasse Spörkel ; Axel Koslowski ; Wolfgang Weber ; Rainer Steiger ; Mirjam Scholten ; Walter Thiel
• 刊名：Journal of Chemical Theory and Computation
• 出版年：2016
• 出版时间：March 8, 2016
• 年：2016
• 卷：12
• 期：3
• 页码：1082-1096
• 全文大小：555K
• ISSN：1549-9626

文摘

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.