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Knowles Partitioning at the Multireference Level.

Ágnes Szabados1, András Gombás1, Péter R Surján1

  • 1Laboratory of Theoretical Chemistry, Institute of Chemistry, Faculty of Science, ELTE Eötvös Loránd University, H-1518 Budapest 112, Budapest P.O.B. 32, Hungary.

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This study introduces a multireference extension of a partitioning method to investigate electronic systems with moderate electron correlation. The approach utilizes multiconfiguration perturbation theory for enhanced computational accuracy.

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Area of Science:

  • Quantum Chemistry
  • Computational Physics
  • Theoretical Chemistry

Background:

  • Accurate electronic structure calculations are crucial for understanding chemical phenomena.
  • Existing methods may struggle with systems exhibiting medium levels of electron correlation.
  • Recent advancements in partitioning techniques offer new avenues for computational efficiency.

Purpose of the Study:

  • To generalize a recently developed partitioning method for multireference electronic systems.
  • To enable the study of electronic systems at a medium level of correlation.
  • To apply the multiconfiguration perturbation theory (MCPT) framework.

Main Methods:

  • Generalization of Knowles' partitioning method.
  • Application of the multiconfiguration perturbation theory (MCPT) formalism.
  • Development of a multireference computational approach.

Main Results:

  • A novel multireference generalization of a partitioning technique is established.
  • The developed method is suitable for studying electronic systems with medium correlation.
  • Successful integration within the MCPT framework.

Conclusions:

  • The presented multireference partitioning method offers a viable approach for medium-correlation systems.
  • This work extends the applicability of partitioning techniques in quantum chemistry.
  • The MCPT framework provides a robust foundation for these advanced calculations.