6. Contribution of X-ray absorption spectroscopy

6.1 Principle of X-ray absorption spectroscopy

Unlike diffraction, X-ray absorption spectroscopy provides information on the local order around a target atom. This technique involves measuring the absorption coefficient of the material near an absorption threshold of the target atom, as a function of the energy of the incident radiation. An increase in the absorption coefficient is expected for energies above the absorption threshold value, and the evolution should give a sharp edge as shown in figure 21 a. In reality, oscillations are observed near and after the absorption...