title: Soft X-ray absorption spectroscopy and resonant inelastic X-ray scattering spectroscopy below 100 eV: probing first-row transition-metal M-edges in chemical complexes.
abstract: X-ray absorption and scattering spectroscopies involving the 3d transition-metal K- and L-edges have a long history in studying inorganic and bioinorganic molecules. However, there have been very few studies using the M-edges, which are below 100 eV. Synchrotron-based X-ray sources can have higher energy resolution at M-edges. M-edge X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) could therefore provide complementary information to K- and L-edge spectroscopies. In this study, M2,3-edge XAS on several Co, Ni and Cu complexes are measured and their spectral information, such as chemical shifts and covalency effects, are analyzed and discussed. In addition, M2,3-edge RIXS on NiO, NiF2 and two other covalent complexes have been performed and different d-d transition patterns have been observed. Although still preliminary, this work on 3d metal complexes demonstrates the potential to use M-edge XAS and RIXS on more complicated 3d metal complexes in the future. The potential for using high-sensitivity and high-resolution superconducting tunnel junction X-ray detectors below 100 eV is also illustrated and discussed.
authors.affiliation: Department of Chemistry, University of California, 1 Shields Avenue, Davis, CA 95616, USA. hxwang2@lbl.gov
authors.forename: Hongxin
authors.initials: H
authors.lastname: Wang
authors.forename: Anthony T
authors.initials: AT
authors.lastname: Young
authors.forename: Jinghua
authors.initials: J
authors.lastname: Guo
authors.forename: Stephen P
authors.initials: SP
authors.lastname: Cramer
authors.forename: Stephan
authors.initials: S
authors.lastname: Friedrich
authors.forename: Artur
authors.initials: A
authors.lastname: Braun
authors.forename: Weiwei
authors.initials: W
authors.lastname: Gu
mesh_terms: D008670:Metals / Q000737:chemistry*; D012542:Scattering, Radiation; D012666:Semiconductors; D056928:X-Ray Absorption Spectroscopy
chemical_list: D008670:Metals
keywords: 3d metal M-edge; resonance inelastic X-ray scattering (RIXS); soft X-ray absorption spectroscopy (XAS); superconducting tunnel junction (STJ) X-ray detector