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A practical valence bond method: a configuration interaction method approach with perturbation theoretic facility.

Lingchun Song1, Wei Wu, Qianer Zhang

  • 1Department of Chemistry, Center for Theoretical Chemistry, and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, Fujian 361005, People's Republic of China.

Journal of Computational Chemistry
|January 22, 2004
PubMed
Summary
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This study enhances the valence bond configuration interaction (VBCI) method with improved procedures for accurate and cost-effective computational chemistry, reducing computational cost with little loss in accuracy.

Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Theoretical Chemistry

Background:

  • The valence bond configuration interaction (VBCI) method previously established by Wu et al. (2002) offers a robust framework for electronic structure calculations.
  • Existing VBCI methods can be computationally intensive, necessitating more efficient approaches for complex chemical systems.

Purpose of the Study:

  • To extend and improve the valence bond configuration interaction (VBCI) method.
  • To develop accurate and cost-effective computational procedures for chemical reaction studies.
  • To enhance the reliability and applicability of VBCI in quantum chemical calculations.

Main Methods:

  • Incorporation of quadruplet excitation effects using the Davidson correction to address size consistency issues.

Related Experiment Videos

  • Introduction of the VBCI(D, S) procedure, including doubly excited structures for active electrons and singly excited structures for inactive pairs.
  • Utilization of second-order perturbation theory for efficient configuration selection, reducing computational cost.

    • Main Results:

    • The Davidson correction improves the quality of computational results and reduces size consistency problems.
    • The VBCI(D, S) procedure achieves accuracy comparable to VBCISD with significantly reduced computational effort.
    • Second-order perturbation theory-based configuration selection leads to substantial cost reduction with minimal impact on accuracy.

    Conclusions:

    • The enhanced VBCI method offers accurate and cost-effective computational procedures for quantum chemistry.
    • The developed methods are applicable to calculating bond energies and reaction barriers.
    • These improvements make advanced electronic structure calculations more accessible and efficient.