Crystal Orbital Overlap Population and X-ray Absorption Spectroscopy

Area of Science:

• Computational materials science
• Quantum chemistry
• Spectroscopy

Background:

• Accurate electronic structure calculations are crucial for understanding material properties.
• X-ray spectroscopies provide detailed information about electronic states and bonding.

Purpose of the Study:

• To develop and present an integrated computational tool for simultaneous calculation of X-ray spectroscopies and crystal orbital overlap populations.
• To establish a direct correlation between experimental spectral features and chemical bonding environments.

Main Methods:

• Utilizing density functional theory (DFT) for electronic structure calculations.
• Calculating occupied and nonoccupied electronic states, including X-ray emission spectroscopy (XES) and X-ray absorption near edge structure (XANES).
• Evaluating orbital overlap populations to quantify covalency between atoms.

Main Results:

• Demonstrated the capability of the tool to analyze diverse materials, including molecules and oxides.
• Successfully correlated spectral features with specific chemical bonds and electronic structures.
• Provided insights into the electronic structure of materials like TiO2, Li2RuO3, ZnO, and V2O3.

Conclusions:

• The developed numerical tool offers a unified approach to interpret X-ray spectra and chemical bonding.
• This method enhances the understanding of structure-property relationships in materials science.
• The study validates the computational approach through various experimental examples.