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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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Combining two-body density correlation functionals with multiconfigurational wave functions using natural orbitals

Angel J Pérez-Jiménez¹, José M Pérez-Jordá, Juan C Sancho-García

¹Departamento de Química-Física, Universidad de Alicante, Alicante E-03080, Spain. aj.perez@ua.es

The Journal of Chemical Physics

|September 18, 2007

Summary

This study introduces a new computational chemistry method combining multiconfigurational (MC) wave functions with density correlation functionals. The approach accurately predicts molecular properties for various chemical systems, offering improved accuracy for electronic structure calculations.

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Area of Science:

Computational Chemistry
Quantum Chemistry
Theoretical Chemistry

Background:

Accurate prediction of molecular properties is crucial for understanding chemical phenomena.
Existing methods often struggle with strongly correlated systems.

Purpose of the Study:

To develop a novel procedure combining multiconfigurational (MC) wave functions with two-body density correlation functionals.
To enhance the accuracy of electronic structure calculations for challenging molecular systems.

Main Methods:

Transforming two-body density correlation functionals into functionals of MC natural orbitals and occupation numbers.
Applying the procedure to the Colle-Salvetti functional and a size-consistent functional (F1-5-N(eff)).

Main Results:

The method was tested on spectroscopic constants, reaction barriers, spin-state energy differences, and magnetic coupling constants for diverse molecules.
The transformed F1-5-N(eff) functional yielded the best results on average.

Conclusions:

The proposed procedure offers a robust approach for improving the accuracy of quantum chemical calculations.
This method provides a valuable tool for studying complex electronic structures and predicting molecular properties.