Energy decomposition analysis based on broken symmetry unrestricted density functional theory

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Abstract

In this paper, the generalized Kohn-Sham energy decomposition analysis (GKS-EDA) scheme is extended to molecular interactions in open shell singlet states, which is a challenge for many popular EDA methods due to the multireference character. Based on broken symmetry (BS) unrestricted density functional theory with a spin projection approximation, the extension scheme, named GKS-EDA(BS) in this paper, divides the total interaction energy into electrostatic, exchange-repulsion, polarization, correlation, and dispersion terms. Test examples include the pancake bond in the phenalenyl dimer, the ligand interactions in the Fe(ii)-porphyrin complexes, and the radical interactions in dehydrogenated guanine-cytosine base pairs and show that GKS-EDA(BS) is a practical EDA tool for open shell singlet systems.

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Tang, Z., Jiang, Z., Chen, H., Su, P., & Wu, W. (2019). Energy decomposition analysis based on broken symmetry unrestricted density functional theory. Journal of Chemical Physics, 151(24). https://doi.org/10.1063/1.5114611

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