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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Full potential x-ray absorption calculations using time dependent density functional theory.

O Bunău1, Y Joly

  • 1Institut Néel CNRS-UJF, Grenoble, France. bunau@impmc.upmc.fr

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 27, 2012
PubMed
Summary
This summary is machine-generated.

We developed a new relativistic time-dependent density functional theory (TDDFT) method for x-ray absorption spectroscopy. This advanced method improves accuracy for extended systems compared to older techniques.

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Area of Science:

  • Computational Physics
  • Quantum Chemistry
  • Materials Science

Background:

  • X-ray absorption spectroscopy (XAS) is crucial for material characterization.
  • Previous calculations for extended systems often used approximations like the muffin-tin method.
  • Relativistic effects are important for accurate spectroscopy, especially for heavy elements.

Purpose of the Study:

  • To implement a fully relativistic time-dependent density functional theory (TDDFT) method for XAS calculations.
  • To introduce a full potential ground state calculation within TDDFT for extended systems.
  • To demonstrate the superiority of this new approach over existing methods.

Main Methods:

  • Developed a fully relativistic TDDFT computational method.
  • Incorporated a full potential ground state calculation.
  • Applied the method to calculate XAS for extended systems.

Main Results:

  • The new TDDFT implementation accurately simulates XAS for extended systems.
  • The full potential ground state calculation provides superior results compared to muffin-tin methods.
  • Demonstrated a clear improvement in accuracy and reliability of the calculated spectra.

Conclusions:

  • The fully relativistic TDDFT method with a full potential ground state is a significant advancement for XAS calculations.
  • This method offers improved accuracy for studying extended systems.
  • It provides a more reliable tool for materials characterization and electronic structure investigations.