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An ab initio intermolecular potential energy surface for the F(2) dimer.

Mohammad H Karimi-Jafari1, Ali Maghari

  • 1Department of Physical Chemistry, School of Chemistry, University of Tehran, Tehran, Iran.

The Journal of Physical Chemistry. A
|June 16, 2007
PubMed
Summary

Researchers developed potential energy surfaces for the F(2) dimer using advanced computational methods. The study identified stable configurations and analyzed interaction energies, improving theoretical models for molecular interactions.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Molecular Interactions

Background:

  • Accurate potential energy surfaces (PES) are crucial for understanding molecular interactions.
  • Ab initio calculations provide a fundamental approach to deriving PES.
  • Previous studies may lack high-level theoretical treatments for the F(2) dimer.

Purpose of the Study:

  • To construct accurate analytical representations of the F(2) dimer's potential energy surface.
  • To investigate the influence of monomer properties, like hexadecapole moments, on interaction anisotropy.
  • To validate the derived potentials by comparing calculated second virial coefficients with experimental data.

Main Methods:

  • Employed ab initio calculations up to fourth-order Møller-Plesset (MP4) perturbation theory.
  • Utilized the aug-cc-pVTZ basis set to approximate the complete basis set limit.
  • Determined the complete basis set limit of interaction energy and analyzed basis set incompleteness errors.

Main Results:

  • Identified the most stable F(2) dimer structure at specific geometric parameters (R, theta(a), theta(b), phi) with a well depth of 716 microE(h).
  • Discovered two additional minima corresponding to canted and X-shaped configurations with energies around -596 and -629 microE(h).
  • Demonstrated the significant role of hexadecapole moments in the R-dependent anisotropy of interaction energy.

Conclusions:

  • The developed analytical potentials accurately represent the F(2) dimer's interaction energy surface.
  • The MP4 potential shows improved agreement with experimental second virial coefficient values, validating the theoretical approach.
  • This work provides a refined understanding of intermolecular forces in the F(2) dimer system.