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Chapitre D'ouvrage Année : 2016

Theory of X-ray Absorption Near Edge Structure

Yves Joly
S Grenier

Résumé

The purpose of this chapter is to the present the main steps explaining the x-ray absorption phenomenon, specially in the low energy part of the edge spectra. We start from the interaction Hamiltonian between the electromagnetic-field and one electron. We give then the transition rate between two states. From this, the general equations for the absorption process in a material is given. We show that depending on the edge and on the material, different theories can be better to simulate an experiment. Sometimes monoelectronic techniques are sufficient, but a large area around the absorbing atoms must be considered. In the opposite case, multi-electronic phenomena are dominant, but system can be described by some simple parameters. Finally, we present briefly some of the most recent research devoted to situations where both multi-electronic and multi-atomic aspects are important.
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Dates et versions

hal-01270524 , version 1 (08-02-2016)

Identifiants

Citer

Yves Joly, S Grenier. Theory of X-ray Absorption Near Edge Structure. J. A. van Bokhoven and C. Lamberti. X-ray Absorption and X-ray Emission Spectroscopy – Theory and Applications, John Wiley & Sons, Ltd., pp.73, 2016, 978-1-118-84423-6. ⟨10.1002/9781118844243.ch4⟩. ⟨hal-01270524⟩

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