X-Ray Absorption Edges of Transition Metal Salts

Abstract

A series of iT-edges of transition elements in ionic compounds are presented. It is found that absorption in the 3d region is most prominent in cases where the bonding is least ionic and the symmetry is lowest. As the 3d levels become progressively filled, this low-lying absorption disappears.

A conformational role for NifW in the maturation of molybdenum nitrogenase P-cluster

“…Meanwhile, pre-edge intensity at the Fe K-edge derives from both lowering of centrosymmetry, which induces Fe 3d-4p mixing, and the number of available holes in the valence shell of Fe. 28,29 Hence, relative increases in pre-edge intensity can arise from either a decrease in local symmetry, increase in oxidation state, or some combination. Therefore, these changes are all consistent with some degree of Fe-centered oxidation upon exposure to IDS.…”

Study on the Dispersion of Nickel Ions in the NiO−MgO System by X-ray Absorption Fine Structure

“…The peak intensity is closely related to the symmetry around Ni atoms; − i . e ., this peak becomes more intense as the symmetry around the Ni center is distorted from the regular octahedron. − The areas of pre-edge peaks of the samples are summarized in Table . The important point to be noted is that the intensities of all samples are weaker than that of NiO, although the area becomes larger with an increase in the nickel concentration.…”

Local structural change in GaCrN grown by radio frequency plasma-assisted molecular-beam epitaxy

“…5. A pre-edge structure is known as a characteristic only for transition metals [13][14][15] and is sensitive to the local site symmetry around absorbing atoms. From Fig.…”