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X-ray absorption spectroscopy (XAS) Fe K-edge spectra of the FeSex (x=1-0.8)single crystals cleaved in situ in vacuum reveal characteristic Fe 4sp states,a lattice distortion and the Se K-edge spectra point to a strong Fe 3d-Se 4phybridization giving rise to itinerant charge carriers. A formal charge of~1.8+ for Fe and ~2.2- for Se were evaluated from these spectra in the FeSex(x=0.88). The charge balance between Fe and Se is assigned itinerant electronslocated in the Fe-Se hybridization bond. As x decreases the 4p hole countincreases and a crystal structure distortion is observed that in turn causesthe Fe separation in the ab plane change from 4p orbital to varying(modulating) coordination. Powder x-ray diffraction (XRD) measurements alsoshow a slight increase in lattice parameters as x decreases (increasing Sedeficiency).

X-ray absorption spectroscopy (XAS) investigation of the electronic structure of superconducting FeSex single crystals