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![[Figure 5]](yx5001fig5mag.jpg)
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Figure 5
The integrated intensity of the (003) superlattice Bragg peak as a function of the photon energy around the M5 and M4 absorption edge of U and Np in UO2 and NpO2. Data were collected in the ordered phase, with the incident beam polarized perpendicularly to the diffraction plane (σ) and the scattered photon beam polarized in the diffraction plane (π). The intensity data are corrected for self-absorption. The maxima of the intensity enhancement occur at the E1 dipole threshold energy and are associated with 3d3/2,5/2 → 5f transitions. Note that the shape of the M4 resonance in NpO2 is a Lorentzian squared, as predicted by Nagao & Igarashi (2005  ). The inset on the upper side is a schematic representation of the resonant scattering process. The central inset is a sketch of the scattering geometry used to measure the integrated intensity as a function of azimuthal angle Ψ, describing the rotation of the sample about the scattering vector. The arrows ε(i,f)(σ, π) correspond to the polarization direction of photons polarized perpendicularly (σ) or parallel (π) to the scattering plane. The u3 Cartesian axis is antiparallel to scattering vector Q. |
![[Figure 5]](yx5001fig5.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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