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Resonant X-ray diffraction: Basic theoretical principles |
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| Authors: | Y Joly S D Matteo O Bun?u |
| Institution: | 1. Institut N??el, CNRS and Universit?? Joseph Fourier, BP. 166, 38042, Grenoble Cedex 9, France 2. ??quipe de Physique des Surfaces et Interfaces, Institut de Physique de Rennes, CNRS UMR 6251, Universit?? de Rennes 1, Rennes, France 3. IMPMC, CNRS UMR 7590, Universit?? Pierre et Marie Curie Paris VI, IPGP, 4 place Jussieu, 75052, Paris Cedex 05, France |
| Abstract: | We present the main steps governing the theory of resonant X-ray diffraction (RXD). We focus on the derivation of the anomalous scattering amplitude from perturbation theory and starting from the low-energy expansion of the Dirac Hamiltonian. We give the main ingredients of the multipolar expansion in term of electric and magnetic transitions. We also show the expansion in terms of scattering tensors of the material. We end by giving the RXD formula necessary to simulate in practice this spectroscopy. |
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