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Understanding Electronic Excitations Between Single Determinants with Occupied-Virtual Orbitals for Chemical Valence.

Hengyuan Shen1, Nicola Bogo2, Christopher J Stein2,3

  • 1Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, California 94720, United States.

Journal of Chemical Theory and Computation
|September 15, 2025
PubMed
Summary
This summary is machine-generated.

We introduce a new method, occupied-virtual orbitals for chemical valence (OVOCV) analysis, to better understand electronic excited states. This method clarifies orbital relaxation effects, offering deeper insights than traditional natural transition orbital analysis.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Theoretical Chemistry

Background:

  • Calculating electronic excited states is crucial for understanding chemical phenomena.
  • Current methods often treat ground and excited states as single determinants.
  • Analyzing orbital character in these calculations requires refined techniques.

Purpose of the Study:

  • To extend the occupied-virtual orbitals for chemical valence (OVOCV) theory for excitation analysis.
  • To introduce an intermediate frozen state for cleaner excitation separation.
  • To analyze orbital relaxation effects in various electronic excitation calculations.

Main Methods:

  • Developed and applied the occupied-virtual orbitals for chemical valence (OVOCV) excitation analysis.
  • Utilized orbital-optimized density functional theory (OO-DFT) calculations.
  • Introduced a polarization-free intermediate frozen state for analysis.

Main Results:

  • OVOCV analysis successfully characterizes excitations, including charge-transfer, core, and valence states.
  • Orbital relaxation effects were quantified, showing significant contributions (4-5 eV) in charge-transfer states.
  • Demonstrated that direct use of natural transition orbitals (NTOs) can obscure orbital relaxation effects.

Conclusions:

  • The extended OVOCV theory provides a robust framework for analyzing electronic excitations.
  • Orbital relaxation is a significant factor in excitation energies that needs careful consideration.
  • OVOCV analysis offers a more comprehensive understanding of electronic excitations compared to NTO analysis.