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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Exact nonadditive kinetic potentials for embedded density functional theory.

Jason D Goodpaster1, Nandini Ananth, Frederick R Manby

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

The Journal of Chemical Physics
|September 7, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces an exact embedded density functional theory (DFT) protocol for accurate calculations. The new method precisely treats kinetic energy components, improving ionization energy predictions over approximate methods.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Embedded Density Functional Theory (DFT) is crucial for modeling large systems.
  • Accurate treatment of the nonadditive kinetic energy component is essential for embedding potentials.
  • Existing approximations like Thomas-Fermi (TF) can lead to significant errors.

Purpose of the Study:

  • To develop and validate a formally exact embedded DFT protocol.
  • To improve the accuracy of ionization energy calculations in atomic systems.
  • To investigate methods for enhancing protocol convergence and applicability to larger systems.

Main Methods:

  • Implemented an embedded DFT protocol with exact treatment of the nonadditive kinetic energy.
  • Combined Zhao-Morrison-Parr constrained search with the King-Handy exact kinetic potential.
  • Introduced a density-based switching function for improved convergence near the nuclear cusp.

Main Results:

  • The exact protocol accurately calculated ionization energies for small atomic systems.
  • Demonstrated significant errors (30%-80%) in ionization energies using TF approximations.
  • Showed that the density-based switching function minimally impacted accuracy while improving convergence.

Conclusions:

  • The developed exact embedded DFT protocol offers high accuracy and stability.
  • The study highlights the limitations of TF approximations in kinetic energy functionals.
  • The protocol shows promise for accurate calculations in complex systems with overlapping densities.