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The correlation consistent composite approach (ccCA): an alternative to the Gaussian-n methods.

Nathan J DeYonker1, Thomas R Cundari, Angela K Wilson

  • 1Center for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, The University of North Texas, Denton, Texas 76203, USA. ndeyonk@unt.edu

The Journal of Chemical Physics
|March 25, 2006
PubMed
Summary

A new computational method, the correlation consistent composite approach (ccCA), offers an alternative to Gaussian-n methods for calculating molecular energies. ccCA achieves high accuracy for enthalpies of formation and other properties without empirical corrections, making it a reliable tool for computational chemistry.

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Area of Science:

  • Computational Chemistry
  • Theoretical Chemistry
  • Quantum Chemistry

Background:

  • Gaussian-n (G1, G2, G3) composite methods are widely used for calculating molecular energies but have limitations.
  • The high-level correction (HLC) in Gn methods evolved into a fitted parameter, losing its physical meaning and potentially introducing systematic errors.
  • There is a need for accurate, reliable, and physically grounded computational methods for predicting molecular properties.

Purpose of the Study:

  • To propose and evaluate a new computational method, the correlation consistent composite approach (ccCA), as an alternative to Gaussian-n methods.
  • To assess the accuracy of ccCA for calculating enthalpies of formation (DeltaHf), ionization potentials (IPs), electron affinities (EAs), and proton affinities (PAs).
  • To investigate the performance of ccCA without empirical corrections like HLC.

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Main Methods:

  • The ccCA approach utilizes correlation consistent polarized valence (cc-pVXZ) basis sets.
  • Molecular geometries and vibrational frequencies were determined using B3LYP density functional theory.
  • Calculations were performed on the G2-1 test set and additional systems to evaluate ccCA's accuracy.

Main Results:

  • ccCA-CBS methods, using cc-pVXZ basis sets with diffuse functions, achieved mean absolute deviations of 1.33 kcal/mol for DeltaHf, 0.81 kcal/mol for IPs, 1.02 kcal/mol for EAs, and 1.51 kcal/mol for PAs on the G2-1 test set.
  • These results were obtained without employing the empirical high-level correction (HLC).
  • ccCA-CBS-2, after incorporating relativistic and spin-orbit effects, yielded a mean absolute deviation of 0.81 kcal/mol for DeltaHf, demonstrating improved accuracy for larger systems.

Conclusions:

  • The ccCA method provides a viable and accurate alternative to existing composite methods for calculating molecular energies and properties.
  • ccCA demonstrates high predictive power without relying on empirical or fitted parameters, enhancing its physical interpretability.
  • The ccCA-CBS approach is suitable as a 'black box' method for systems containing up to 10-15 heavy atoms.