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Title: Equation-of-motion coupled-cluster method with double electron-attaching operators: Theory, implementation, and benchmarks

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/5.0041822· OSTI ID:1852700

We report a production-level implementation of the equation-of-motion (EOM) coupled-cluster (CC) method with double electron-attaching (DEA) EOM operators of 2p and 3p1h types, EOM-DEA-CCSD. This ansatz, suitable for treating electronic structure patterns that can be described as two-electrons-in-many orbitals, represents a useful addition to the EOM-CC family of methods. We analyze the performance of EOM-DEA-CCSD for energy differences and molecular properties. By considering reduced quantities, such as state and transition one-particle density matrices, we compare EOM-DEA-CCSD wave functions with wave functions computed by other EOM-CCSD methods. The benchmarks illustrate that EOM-DEA-CCSD is capable of treating diradicals, bond-breaking, and some types of conical intersections.

Research Organization:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); European Commission (EC); Research Council of Norway
Grant/Contract Number:
SC0018910; CHE-1748821; 765739; 263110; 275506
OSTI ID:
1852700
Alternate ID(s):
OSTI ID: 1771812
Journal Information:
Journal of Chemical Physics, Vol. 154, Issue 11; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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