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A new computational model accurately predicts molecular excitation and ionization energies. This explicitly correlated coupled-cluster method achieves high accuracy, even with smaller basis sets, advancing quantum chemistry calculations.

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Area of Science:

  • Quantum Chemistry
  • Computational Physics
  • Theoretical Chemistry

Background:

  • Coupled-cluster methods are essential for accurate electronic structure calculations.
  • Treating electron correlation, especially short-range effects, remains a challenge.
  • Fock-space coupled-cluster (FSCC) methods are used for excitation and ionization energies.

Purpose of the Study:

  • To develop and implement a linearly approximated explicitly correlated coupled-cluster singles and doubles (CC(2,3)) model within the Fock-space coupled-cluster (FSCC) framework.
  • To extend FSCC wave operators for improved treatment of short-range correlation effects in excited and doubly electron-attached states.
  • To investigate the potential for reducing the number of active virtual orbitals through enhanced short-range correlation treatment.

Main Methods:

  • Formulation and implementation of a linearly approximated explicitly correlated coupled-cluster singles and doubles (CC(2,3)) model.
  • Extension of Fock-space wave operators to incorporate short-range correlation.
  • Application to calculate valence and Rydberg excitation energies, double ionization potentials, and double electron attachment energies for various molecules.

Main Results:

  • The explicitly correlated model achieves high accuracy for excitation energies, within 0.1 eV of the complete basis set limit at the double-ζ level.
  • Similar accuracy is observed for double ionization potentials and double electron attachment energies.
  • Effective reduction in the number of active virtual orbitals is demonstrated through improved short-range correlation treatment.

Conclusions:

  • The developed explicitly correlated FSCC model provides a computationally efficient and accurate approach for determining electronic properties.
  • The method shows promise for accurate predictions of molecular excited states and ionization processes.
  • This advancement facilitates more reliable quantum chemical calculations for complex molecular systems.