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Related Experiment Videos

Linear response time-dependent density functional theory for van der Waals coefficients.

X Chu1, A Dalgarno

  • 1ITAMP Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA.

The Journal of Chemical Physics
|August 31, 2004
PubMed
Summary

This study introduces a linear response time-dependent density functional theory to compute dynamic polarizabilities and van der Waals C(6) coefficients for atom pairs. Results provide C(6) values for main group and transition metal dimers.

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Area of Science:

  • Quantum Chemistry
  • Computational Physics
  • Atomic and Molecular Interactions

Background:

  • Accurate calculation of interatomic forces is crucial for understanding molecular behavior.
  • Van der Waals C(6) coefficients quantify the strength of London dispersion forces, essential for modeling systems from condensed matter to biological molecules.
  • Previous methods for calculating C(6) coefficients had limitations in accuracy and applicability to complex atomic systems.

Purpose of the Study:

  • To develop and apply a linear response time-dependent density functional theory (LR-TDDFT) for calculating dynamic polarizabilities.
  • To compute van der Waals C(6) coefficients for various atom pairs, including those involving transition metals.
  • To provide a reliable dataset of C(6) coefficients for a range of atomic systems.

Main Methods:

Related Experiment Videos

  • Implementation of a linear response time-dependent density functional theory (LR-TDDFT) framework.
  • Calculation of dynamic polarizabilities using the developed LR-TDDFT method.
  • Derivation of van der Waals C(6) coefficients from the calculated dynamic polarizabilities.

Main Results:

  • The study successfully calculated dynamic polarizabilities for complex atom pairs.
  • Accurate van der Waals C(6) coefficients were obtained for dimers of main group atoms.
  • Novel C(6) values were presented for dimers involving the first row of transition metal atoms.

Conclusions:

  • The developed LR-TDDFT method is effective for computing dynamic polarizabilities and C(6) coefficients.
  • The presented C(6) values serve as valuable data for theoretical and computational chemistry.
  • This work advances the understanding of interatomic interactions, particularly for systems containing transition metals.