X-ray-absorption spectroscopy at the Fe L 2 , 3 threshold in iron oxides

摘要: The influence of local order around the iron site on Fe 2p x-ray-absorption spectra is studied for \ensuremath{\alpha}-${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$, FeO, ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$, and \ensuremath{\gamma}-${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$. experimental are accounted thanks to a configuration-interaction calculation ${\mathit{L}}_{2,3}$ edge shapes, explicitly taking into account exact first-neighbor surrounding cation acting through crystal-field splitting hopping terms. peak's splittings intensities well reproduced: contributions various symmetries valencies discriminated. nature insulating gap each compound deduced.