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General excitations in time-dependent density functional theory.

Olav Vahtras1, Zilvinas Rinkevicius

  • 1Department of Theoretical Chemistry, Royal Institute of Technology, S-106 91 Stockholm, Sweden.

The Journal of Chemical Physics
|March 27, 2007
PubMed
Summary
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This study introduces a new time-dependent density functional theory framework to calculate molecular excitations. It enables accurate predictions for states with various multiplicities in systems with non-singlet ground states.

Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Theoretical Physics

Background:

  • Calculating electronic excitations in molecular systems is crucial for understanding photochemistry and spectroscopy.
  • Existing methods often face challenges with systems possessing non-singlet ground states.
  • Accurate prediction of excited states with specific multiplicities is essential for detailed molecular analysis.

Purpose of the Study:

  • To develop a general computational framework for calculating electronic excitations in molecular systems.
  • To address the challenge of determining excited states with arbitrary multiplicities, particularly for systems with non-singlet ground states.
  • To provide a method that is readily integrable into existing computational chemistry software.

Main Methods:

Related Experiment Videos

  • Utilizing time-dependent density functional theory (TD-DFT) as the foundational theoretical approach.
  • Introducing generalized orbital excitation operators to generate excited states with well-defined multiplicities.
  • Employing the noncollinear formulation of density functional theory to handle complex spin states.

    • Main Results:

    • A robust theoretical framework for calculating molecular excitations across various multiplicities has been established.
    • The method successfully handles molecular systems starting from a non-singlet ground state.
    • The proposed approach ensures that the generated excited states possess well-defined spin multiplicities.

    Conclusions:

    • The developed TD-DFT framework offers a significant advancement in the theoretical prediction of molecular excited states.
    • This method provides a versatile tool for studying systems with complex electronic structures, including those with non-singlet ground states.
    • The straightforward implementation ensures broad applicability within the computational chemistry community.