期刊
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
卷 17, 期 5, 页码 2906-2916出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jctc.1c00121
关键词
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资金
- U.S. Department of Energy [DE-SC0018326]
- U.S. Department of Energy (DOE) [DE-SC0018326] Funding Source: U.S. Department of Energy (DOE)
A practical approach is presented for treating static and dynamical correlation in large multiconfigurational systems accurately. The method utilizes the spin-flip approach for static correlation and explores the use of on-top pair-density functional theory for dynamical correlation. The performance of the approach is demonstrated by computing energy gaps between ground and excited states for various challenging open-shell molecular systems.
We present a practical approach to treat static and dynamical correlation accurately in large multiconfigurational systems. The static correlation is taken into account by using the spin-flip approach, which is well-known for capturing static correlation accurately at low-computational expense. Unlike previous approaches to add dynamical correlation to spin-flip models which use perturbation theory or coupled-cluster theory, we explore the ability to use the on-top pair-density functional theory approaches recently developed by Gagliardi and co-workers (J. Comput. Theor. Chem., 2014, 10, 3669). External relaxations are performed in the spin-flip calculations through a restricted active space framework for which a truncation scheme for the orbitals used in the external excitation is presented. The performance of the approach is demonstrated by computing energy gaps between ground and excited states for diradicals, triradicals, and linear polyacene chains ranging from naphthalene to dodecacene. Accurate results are obtained using the new approach for these challenging open-shell molecular systems.
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