Resonant inelastic scattering of X-rays from NiAl: Bloch k→-vector selectivity Original Research Article

Using X-rays of energies around the Ni 1s binding energy (8333 eV), we measured the fluorescence spectra of the valence electrons of a NiAl single crystal for different values of the momentum transfer The shape of the obtained spectra shows a strong dependence on This non-isotropic behaviour of fluorescence from valence electrons is explained by considering the absorption of the incident photon and the re-emission of the fluorescence photon as one single resonant inelastic scattering process, which includes a law of Bloch -vector conservation. By comparing our experimental results with calculations based on this point of view, we show its validity for hard X-rays.