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Related Experiment Videos

Active-space coupled-cluster methods through connected quadruple excitations.

Peng-Dong Fan1, So Hirata

  • 1Quantum Theory Project, Department of Chemistry, University of Florida, Gainesville, Florida 32611-8435, USA.

The Journal of Chemical Physics
|March 18, 2006
PubMed
Summary
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New coupled-cluster methods efficiently calculate electronic structures for molecules. These computational chemistry techniques accurately predict singlet-triplet separations in triatomic hydrides with minimal error.

Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Theoretical Chemistry

Background:

  • Coupled-cluster (CC) methods are essential for accurate electronic structure calculations.
  • Approximations to full CC methods are needed for computational efficiency.
  • Previous work by Adamowicz and Piecuch et al. introduced novel CC ansätze.

Purpose of the Study:

  • To implement and apply novel coupled-cluster methods that include subsets of higher-order excitation amplitudes.
  • To assess the accuracy of these methods for calculating singlet-triplet separations.
  • To investigate the effectiveness of these methods for both closed- and open-shell systems.

Main Methods:

  • Implementation of coupled-cluster methods with partial inclusion of triple and quadruple excitations.

Related Experiment Videos

  • Utilization of parallel computing for enhanced performance.
  • Application of real Abelian point-group symmetry.
  • Automation of implementation using symbolic manipulation programs.
  • Calculation of singlet-triplet separations for five triatomic hydrides, including scalar relativistic effects.

    • Main Results:

    • The implemented methods are applicable to both closed- and open-shell species.
    • The use of a very small subset of higher-order excitations results in minimal errors.
    • Errors in singlet-triplet separations were found to be within a few tenths of 1 kcal/mol.
    • The methods demonstrated remarkable effectiveness for the studied systems.

    Conclusions:

    • Novel coupled-cluster methods incorporating subsets of higher-order excitations are computationally effective and accurate.
    • These methods provide a reliable approach for calculating electronic properties, such as singlet-triplet separations.
    • The approach offers a balance between computational cost and accuracy for molecular electronic structure studies.