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Two determinant distinguishable cluster.

Thomas Schraivogel1, Daniel Kats1

  • 1Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.

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Summary
This summary is machine-generated.

A new two determinant distinguishable cluster (2D-DCSD) method improves accuracy for excited states and diradicals. This advancement enhances computational chemistry accuracy for electronic structure calculations.

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Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Electronic Structure Theory

Background:

  • Coupled cluster methods are essential for accurate electronic structure calculations.
  • The distinguishable cluster approximation offers potential improvements over standard methods.
  • Accurate computation of excited states and diradical properties remains a challenge.

Purpose of the Study:

  • To develop and implement a two-determinant version of the distinguishable cluster singles and doubles (2D-DCSD) method.
  • To compare the performance of 2D-DCSD against the traditional 2D-CCSD method.
  • To assess the accuracy of 2D-DCSD for various electronic systems, including excited states and diradicals.

Main Methods:

  • Development of the 2D-DCSD method.
  • Implementation within the open-source Julia package ElemCo.jl.
  • Benchmarking calculations on singlet and triplet excited states (valence and Rydberg) and singlet-triplet gaps of diradicals.

Main Results:

  • The 2D-DCSD method was successfully implemented in ElemCo.jl.
  • Benchmarking demonstrated the capability of 2D-DCSD to handle excited states and diradicals.
  • The distinguishable cluster approximation was shown to enhance the accuracy of 2D-CCSD.

Conclusions:

  • The developed 2D-DCSD method provides a more accurate approach for electronic structure calculations.
  • ElemCo.jl offers a valuable open-source tool for applying advanced quantum chemical methods.
  • The distinguishable cluster approximation is a promising strategy for improving the accuracy of coupled cluster methods.