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Oxygen K-edge X-ray Absorption Spectra.

Federica Frati1, Myrtille O J Y Hunault2, Frank M F de Groot1

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Summary

This review details oxygen K-edge X-ray absorption spectroscopy for molecules and solids. It covers experimental methods, theoretical simulations, and analyzes spectra across various oxygen-containing systems, including oxides.

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Oxygen K-edge X-ray absorption spectroscopy is a powerful tool for characterizing oxygen-containing molecules and solids.
  • Understanding the electronic structure and bonding in these materials is crucial for various scientific and technological applications.

Purpose of the Study:

  • To provide a comprehensive review of oxygen K-edge X-ray absorption spectroscopy.
  • To discuss experimental techniques, theoretical approximations, and spectral analysis for diverse oxygen systems.
  • To highlight the application of this technique in studying oxides, transition metals, and biomolecular systems.

Main Methods:

  • Overview of experimental aspects: X-ray sources, monochromators, and detection schemes for oxygen K-edge measurements.
  • Discussion of theoretical and conceptual approximations for simulating oxygen K-edge spectra, including Density Functional Theory (DFT).
  • Analysis of time- and spatially-resolved measurements, and operando conditions.

Main Results:

  • Systematic review of oxygen K-edge spectra for atoms, ions, binary molecules, water, larger organic molecules, and biomolecular systems.
  • Detailed analysis of experimental results for solid oxides, including s-, p-, and d-electron systems.
  • Demonstration of DFT accuracy in simulating spectra and discussion of crystal field effects, oxidation states, and covalency in transition metal oxides.

Conclusions:

  • Oxygen K-edge X-ray absorption spectroscopy is a versatile technique for probing electronic structure in a wide range of oxygen-containing materials.
  • Theoretical simulations, particularly DFT, provide accurate descriptions of experimental spectra, aiding in detailed analysis.
  • The review offers a systematic overview and analysis of spectral trends across different electronic systems.