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A new computational method, equation-of-motion double electron-attaching coupled-cluster singles and doubles (EOM-DEA-CCSD), effectively models complex electronic structures. This approach accurately calculates molecular properties for challenging systems like diradicals and bond-breaking scenarios.

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Area of Science:

  • Quantum chemistry
  • Computational physics
  • Theoretical chemistry

Background:

  • The equation-of-motion coupled-cluster (EOM-CC) framework is a powerful tool for electronic structure calculations.
  • Accurately describing systems with multi-reference character, such as diradicals and bond-breaking processes, remains a challenge for standard EOM-CC methods.

Purpose of the Study:

  • To implement and evaluate a production-level equation-of-motion coupled-cluster method with double electron-attaching (DEA) EOM operators.
  • To assess the performance of the newly developed EOM-DEA-CCSD method for calculating energy differences and molecular properties.
  • To compare the accuracy of EOM-DEA-CCSD wave functions with those from other EOM-CC methods using reduced density matrices.

Main Methods:

  • Implementation of the equation-of-motion coupled-cluster singles and doubles (EOM-CCSD) method incorporating double electron-attaching (DEA) EOM operators.
  • Development of 2p and 3p1h type DEA EOM operators within the EOM-CC formalism.
  • Analysis of electronic structure patterns suitable for the 'two-electrons-in-many orbitals' ansatz.
  • Computation of energy differences and molecular properties using EOM-DEA-CCSD.
  • Comparison of EOM-DEA-CCSD wave functions with other EOM-CCSD methods via state and transition one-particle density matrices.

Main Results:

  • Successful production-level implementation of the EOM-DEA-CCSD method.
  • Demonstrated capability of EOM-DEA-CCSD to accurately describe challenging electronic structure phenomena.
  • Benchmarks show EOM-DEA-CCSD's effectiveness in treating diradicals, bond-breaking processes, and certain conical intersections.
  • Analysis of one-particle density matrices confirms the validity and accuracy of the EOM-DEA-CCSD wave functions.

Conclusions:

  • EOM-DEA-CCSD is a valuable addition to the EOM-CC family of methods.
  • The method provides an accurate and efficient way to study systems with multi-reference character.
  • EOM-DEA-CCSD offers a robust approach for investigating complex molecular behaviors in quantum chemistry.