Inelastic x-ray scattering measurements of iron organophosphonate - art. no. 075113

Results of theoretical and experimental studies of 3d states of divalent Fe ions in Fe[C2H5PO3] . H2O are reported. Partial density of the Fe 3d state s is calculated in the LDA + U formalism and used for modeling the final st ate of emission in Fe L-2.3 x-ray spectra obtained at near-threshold excita tion. The variation of the spectral shape with the energy of incident radia tion is discussed. For the excitation energy near the Fe L-2 threshold, an anomalous enhancement of L-2 emission is observed. This effect is interpret ed as a result of resonance interaction between two radiation channels. The first of them is a normal fluorescence, which is static in the energy scal e of photons and which is due to ionization of Fe atoms. The other channel is a "drifting" emission due to excitation of Fe atoms in the course of abs orption of incident radiation.