Many-body expansion of the Fock matrix in the fragment molecular orbital method
| Autor: | Kazuo Kitaura, Dmitri G. Fedorov |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010304 chemical physics
Chemistry Crambin General Physics and Astronomy 010402 general chemistry 01 natural sciences 0104 chemical sciences Atomic orbital Fock matrix 0103 physical sciences Density of states Molecular orbital Density functional theory Water cluster Physical and Theoretical Chemistry Atomic physics Fragment molecular orbital |
| Zdroj: | The Journal of chemical physics. 147(10) |
| ISSN: | 1089-7690 |
| Popis: | A many-body expansion of the Fock matrix in the fragment molecular orbital method is derived up to three-body terms for restricted Hartree-Fock and density functional theory in the atomic orbital basis and compared to the expansion in the basis of fragment molecular orbitals (MOs). The physical nature of many-body corrections is revealed in terms of charge transfer terms. An improvement of the fragment MO expansion is proposed by adding exchange to the embedding. The accuracy of all developed methods is demonstrated in comparison to unfragmented results for polyalanines, a water cluster, Trp-cage (PDB: 1L2Y) and crambin (PDB: 1CRN) proteins, a zeolite cluster, a Si nano-wire, and a boron nitride ribbon. The physical nature of metallicity is discussed, and it is shown what kinds of metallic systems can be treated by fragment-based methods. The density of states is calculated for a fully closed and a partially open nano-ring of boron nitride with a diameter of 105 nm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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