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  • 1Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

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Summary

We developed a new computational method for accurately calculating excited states of molecules. This excited-state-specific coupled-cluster approach improves upon existing theories for various electronic transitions.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Theoretical Chemistry

Background:

  • Accurate calculation of molecular excited states is crucial for understanding photochemistry and spectroscopy.
  • Existing methods often struggle with describing complex electronic transitions, such as charge transfer and Rydberg states.

Purpose of the Study:

  • To introduce a novel excited-state-specific coupled-cluster (CC) approach for electronic structure calculations.
  • To enable simultaneous optimization of molecular orbitals and cluster amplitudes for individual excited states.

Main Methods:

  • Formulation of the theory via pseudoprojection of the traditional CC wavefunction.
  • Introduction of correlation effects on an excited-state mean-field starting point.
  • Implementation with N^6 cost scaling, similar to ground-state CC methods.

Main Results:

  • The new method demonstrates size extensivity.
  • Preliminary tests show improved accuracy over excited-state-specific second-order perturbation theory.
  • Enhancements with N^5 perturbative corrections further boost performance for valence, charge transfer, and Rydberg states.

Conclusions:

  • The excited-state-specific CC approach offers a promising advancement in computational quantum chemistry.
  • This method provides a more accurate and robust tool for studying molecular excited states.
  • Further development and application of this method are expected to yield deeper insights into photophysical processes.