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Updated: May 25, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
12:11

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

Quasi-variational coupled cluster theory.

James B Robinson1, Peter J Knowles

  • 1School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom.

The Journal of Chemical Physics
|February 11, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a new quantum chemical method called quasi-variational coupled cluster. This approach significantly improves calculations for systems with strong electron correlation, outperforming previous methods.

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Last Updated: May 25, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
12:11

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

Area of Science:

  • Quantum chemistry
  • Computational chemistry
  • Theoretical chemistry

Background:

  • Variational coupled cluster (VCC) methods are essential for accurate electronic structure calculations.
  • Approximations in VCC methods are necessary for computational feasibility but can limit accuracy, especially for strong correlation.
  • Previous work focused on improving VCC approximations.

Purpose of the Study:

  • To develop a new, robust quantum chemical method for approximating the variational coupled cluster energy.
  • To address limitations of existing VCC approximations in strongly correlated systems.
  • To introduce the quasi-variational coupled cluster (QVCC) method.

Main Methods:

  • Formulation of the quasi-variational coupled cluster (QVCC) method.
  • Integration of linked pair functional transformations to balance infinite-order contributions.
  • Application of the method to systems exhibiting strong static electron correlation.

Main Results:

  • The QVCC method provides a balanced approximation of the energy at all orders.
  • QVCC demonstrates significant robustness in the presence of strong static electron correlation.
  • The new method shows substantial improvement over earlier approximate VCC approaches.

Conclusions:

  • The quasi-variational coupled cluster method is a significant advancement in quantum chemical calculations.
  • QVCC offers improved accuracy and reliability for strongly correlated electronic systems.
  • This work paves the way for more accurate theoretical studies in challenging chemical environments.