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Summary
This summary is machine-generated.

This study introduces a new computational method for accurately describing charge transfer excitations using Slater functions and projector augmented waves. Utilizing Huzinaga

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Accurate description of electronic excitations is crucial in chemistry and materials science.
  • Range-separated functionals offer improved accuracy for charge transfer excitations.
  • Real-space implementations can overcome limitations of traditional reciprocal-space methods.

Purpose of the Study:

  • To implement and verify a real-space method for range-separated functionals using Slater functions.
  • To apply the method to the challenging problem of charge transfer excitations.
  • To investigate convergence properties and identify strategies for improvement.

Main Methods:

  • Implementation of range-separated functionals with Slater functions on grids.
  • Utilizing the projector augmented waves (PAW) method.
  • Solving the screened Poisson equation for screened exchange integrals on Cartesian grids.

Main Results:

  • Demonstrated slow convergence with standard unoccupied orbitals in linear response time-dependent density functional theory (LR-TDDFT).
  • Showed significant convergence improvement by employing Huzinaga's virtual orbitals.
  • Achieved accurate determination of long-range charge transfer excitations using ground-state calculations.

Conclusions:

  • The developed real-space method provides an efficient and accurate approach for charge transfer excitations.
  • Huzinaga's virtual orbitals are essential for achieving rapid convergence in LR-TDDFT calculations.
  • This work enables accurate long-range charge transfer excitation calculations via ground-state properties.