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Updated: Aug 11, 2025

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
Dispersion Energy from the Time-Independent Coupled-Cluster Polarization Propagator.
Piotr S Żuchowski1, Robert Moszynski2
1Faculty of Physics, Astronomy and Applied Informatics, Institute of Physics, Nicolas Copernicus University in Torun, Grudziadzka 5/7, Torun87-100, Poland.
We developed a new CCPP2(T) method for calculating dispersion energy. This approach accurately predicts dispersion interactions, even for complex systems, offering a systematically improvable theory.
Area of Science:
- Computational chemistry
- Quantum chemistry
- Theoretical physics
Background:
- Accurate calculation of dispersion energy is crucial for understanding intermolecular forces.
- Existing methods may face limitations in accuracy or computational cost for complex systems.
Purpose of the Study:
- To present a novel, accurate, and systematically improvable method for calculating dispersion energy.
- To introduce the CCPP2(T) approximate scheme for second-order dispersion energy calculations.
Main Methods:
- Utilizing the Longuet-Higgins integral and time-independent coupled-cluster response theory.
- Expressing dispersion energy via cluster amplitudes and excitation operators obtained from a linear equation.
- Developing the CCPP2(T) scheme for intramonomer correlation accurate to the second order.
Main Results:
- The CCPP2(T) method demonstrates high accuracy for dispersion energy calculations, validated against full configuration interaction (FCI) for He2.
- For more complex systems, CCPP2(T) achieves accuracy comparable to the best existing methods.
- The method provides a robust and accurate calculation of dispersion energy.
Conclusions:
- The developed method offers a significant advancement in the accurate computation of dispersion energy.
- CCPP2(T) provides a reliable and accurate approach for various chemical systems.
- The theory is systematically improvable for higher-order excitations, enabling future refinements.
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