Outstanding performance of configuration interaction singles and doubles using exact exchange Kohn-Sham orbitals in real-space numerical grid method

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To assess the performance of multi-configuration methods using exact exchange Kohn-Sham (KS) orbitals, we implemented configuration interaction singles and doubles (CISD) in a real-space numerical grid code. We obtained KS orbitals with the exchange-only optimized effective potential under the Krieger-Li-Iafrate (KLI) approximation. Thanks to the distinctive features of KLI orbitals against Hartree-Fock (HF), such as bound virtual orbitals with compact shapes and orbital energy gaps similar to excitation energies; KLI-CISD for small molecules shows much faster convergence as a function of simulation box size and active space (i.e., the number of virtual orbitals) than HF-CISD. The former also gives more accurate excitation energies with a few dominant configurations than the latter, even with many more configurations. The systematic control of basis set errors is straightforward in grid bases. Therefore, grid-based multi-configuration methods using exact exchange KS orbitals provide a promising new way to make accurate electronic structure calculations. Published by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2016-12
Language
English
Article Type
Article
Keywords

DENSITY-FUNCTIONAL THEORY; NORM-CONSERVING PSEUDOPOTENTIALS; MOLECULAR-EXCITATION ENERGIES; EFFECTIVE POTENTIAL METHOD; IMPROVED VIRTUAL ORBITALS; LI-IAFRATE APPROXIMATION; HARTREE-FOCK ORBITALS; EIGENVALUE PROBLEMS; HYDROGEN MOLECULE; EXCITED-STATES

Citation

JOURNAL OF CHEMICAL PHYSICS, v.145, no.22

ISSN
0021-9606
DOI
10.1063/1.4971786
URI
http://hdl.handle.net/10203/219603
Appears in Collection
CH-Journal Papers(저널논문)
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