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Energy and Analytic Gradients for the Orbital-Optimized Coupled-Cluster Doubles Method with the Density-Fitting Approximation: An Efficient Implementation

preprint
submitted on 09.10.2020 and posted on 13.10.2020 by Uğur Bozkaya, Aslı Ünal, Yavuz Alagöz
Efficient implementations of the orbital-optimized coupled-cluster doubles [or simply ``optimized CCD'', OCCD, for short] method and its analytic energy gradients with the density-fitting (DF) approach, denoted by DF-OCCD, are presented. In addition to the DF approach, the Cholesky-decomposed variant (CD-OCCD) is also implemented for energy computations. The computational cost of the DF-OCCD method is compared with that of the conventional OCCD. In the conventional OCCD, one needs to perform four-index integrals transformations at each CCD iterations, which limits its applications to large chemical systems. Our results demonstrate that DF-OCCD provides significantly lower computational costs compared to OCCD, there are almost 7-fold reductions in the computational time for the \ce{C5H12} molecule with the cc-pVTZ basis set. For open-shell geometries, interaction energies, and hydrogen transfer reactions, DF-OCCD provides significant improvements upon DF-CCD. Further, several factors make DF-OCCD more attractive compared to CCSD: (1) for DF-OCCD there is no need for orbital relaxation contributions in analytic gradient computations (2) active spaces can readily be incorporated into DF-OCCD (3) DF-OCCD provides accurate vibrational frequencies when symmetry-breaking problems are observed (4) in its response function, DF-OCCD avoids artificial poles; hence, excited-state molecular properties can be computed via linear response theory (5) Symmetric and asymmetric triples corrections based on DF-OCCD [DF-OCCD(T)] has a significantly better performance in near degeneracy regions.

Funding

Scientific and Technological Research Council of Turkey (118Z916)

History

Email Address of Submitting Author

ugrbzky@gmail.com

Institution

HACETTEPE UNIVERSITY

Country

Turkey

ORCID For Submitting Author

0000-0002-5203-2210

Declaration of Conflict of Interest

No conflict of interest

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