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Related Experiment Video

Updated: Jun 5, 2026

Modeling Ligands into Maps Derived from Electron Cryomicroscopy

Modeling Ligands into Maps Derived from Electron Cryomicroscopy

Published on: July 19, 2024

A linked electron pair functional.

Peter J Knowles¹, Bridgette Cooper

¹School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom. KnowlesPJ@Cardiff.ac.uk

The Journal of Chemical Physics

|December 22, 2010

Summary

This summary is machine-generated.

This study introduces a new variational configuration interaction functional for molecular electronic structure calculations. The modified method offers improved accuracy over standard coupled-cluster techniques, especially for challenging electronic systems.

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Area of Science:

Quantum Chemistry
Computational Molecular Science
Electronic Structure Theory

Background:

Standard coupled-cluster methods face limitations when the reference Slater determinant is a poor approximation.
Existing variational configuration interaction functionals may lack extensivity or invariance properties.

Purpose of the Study:

To present a modified variational configuration interaction functional for accurate molecular electronic structure.
To develop a method that is both extensive and invariant to orbital basis transformations.
To provide an approximation to variational coupled cluster.

Main Methods:

Modification of the variational configuration interaction functional within the first-order interacting space.
Development of a fully linked expression for the modified functional.
Truncation of the exponential cluster operator to approximate variational coupled cluster.

Main Results:

The modified functional is extensive and invariant to orbital basis transformations.
The method is exact for ensembles of separated two-electron subsystems.
Combined methods show superior accuracy compared to standard coupled-cluster, particularly for near-degenerate systems.

Conclusions:

The proposed modified variational configuration interaction functional enhances accuracy in electronic structure calculations.
This approach offers a robust alternative to standard coupled-cluster methods for complex molecular systems.
The method shows promise for accurately describing electronic structures where traditional approximations fail.