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Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Intermolecular potential energy surface for CS2 dimer.

Hossein Farrokhpour¹, Zainab Mombeini, Mansoor Namazian

¹Department of Chemistry, Isfahan University of Technology, Isfahan, Iran. farrokhphossein@gmail.com

Journal of Computational Chemistry

|October 14, 2010

Summary

A new four-dimensional potential energy surface for the carbon disulfide dimer was computationally generated. This study highlights the limitations of Møller-Plesset second-order perturbation (MP2) theory for accurately describing intermolecular interactions.

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Area of Science:

Computational Chemistry
Theoretical Chemistry
Molecular Interactions

Background:

Accurate intermolecular potential energy surfaces are crucial for understanding molecular interactions and predicting bulk properties.
Previous studies may lack high-fidelity potential energy surfaces for specific molecular dimers.

Purpose of the Study:

To develop a novel four-dimensional intermolecular potential energy surface for the carbon disulfide (CS2) dimer.
To assess the accuracy of different theoretical methods, particularly Møller-Plesset second-order perturbation (MP2) theory, for describing CS2 dimer interactions.

Main Methods:

Ab initio calculations of interaction energies using the supermolecular approach.
Employed Møller-Plesset second-order perturbation (MP2) and coupled cluster (QCISD(T), CCSD(T)) levels of theory with augmented correlation consistent basis sets.
Utilized a two-point extrapolation to the complete basis set limit and corrected for basis-set superposition error.

Main Results:

The MP2 level of theory significantly overestimates interaction energies compared to higher-level methods (QCISD(T), CCSD(T)).
An analytical representation of the potential energy surface was derived, and the most stable dimer configuration was identified.
The calculated second virial coefficients were compared with experimental data to validate the potential energy surface.

Conclusions:

The MP2 method is inadequate for accurately describing the CS2 dimer potential energy surface.
The developed potential energy surface provides a reliable foundation for future studies on CS2 fluid properties.
The study emphasizes the importance of selecting appropriate theoretical methods for accurate molecular interaction modeling.