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Related Experiment Videos

Performance of the general-model-space state-universal coupled-cluster method.

Xiangzhu Li1, Josef Paldus

  • 1Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

The multireference, general-model-space, state-universal coupled-cluster (GMS SU CC) method now handles single and double excited states. This advanced computational chemistry technique accurately predicts properties of various molecules, including highly excited states.

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Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Theoretical Chemistry

Background:

  • Coupled-cluster (CC) methods are essential for accurate electronic structure calculations.
  • Handling excited states, especially those with multi-reference character, remains a challenge.
  • The general-model-space (GMS), state-universal (SU) approach offers a unified framework for ground and excited states.

Purpose of the Study:

  • To extend the capabilities of the GMS SU CC method to include single (S) and double (D) excited states.
  • To assess the performance of the extended GMS SU CCSD method for various molecular systems.
  • To evaluate the accuracy of the method by comparing with high-level correlated calculations.

Main Methods:

  • Implementation and application of the multireference, general-model-space, state-universal coupled-cluster (GMS SU CC) method.

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  • Calculations performed for ground and excited states of CH(+), HF, F(2), H(2)O, NH(2), and CH(2) molecules.
  • Systematic enlargement of the model space to capture a larger number of excited states.

    • Main Results:

    • The GMS SU CCSD method successfully computed potential energy curves for diatomic molecules and vertical excitation energies for triatomic molecules.
    • Accurate results were obtained for both low-lying and highly excited states, including those with doubly-excited character.
    • Comparisons with full configuration interaction (FCI) and large-scale configuration interaction (CI) methods validated the accuracy and reliability of the GMS SU CCSD approach.

    Conclusions:

    • The extended GMS SU CC method provides a robust and accurate tool for studying ground and excited states, including complex cases.
    • The systematic improvement of results with increasing model space size demonstrates the method's convergence properties.
    • This advancement enables reliable predictions of electronic states crucial for understanding molecular properties and reactivity.