A general formulation is introduced to treat the influence of the displacements of some atomic centres on X-ray absorption in the single-scattering curved-wave formalism. This formulation is particularly suited to the study of small shifts, but it can also be used to consider finite displacements. As an application, they investigate the influence of thermal motion and structural disorder on the curved-wave extended X-ray absorption fine structure, thus generalising the Debye-Waller and asymmetry factors.
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Christian Brouder (1988) studied this question.
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