High resolution measurement of Kb emission spectra in Mn metal and Mn compounds

S. LIMANDRI; G. TIRAO; M TORRES DELUIGI; S. CEPPI; G. STUTZ; J.A. RIVEROS

Campinas

Congreso; Activity Report LNLS 2007; 2008

LNLS

In transition metals, X-ray Kb spectra consist of main lines (Kb1;3, Kb5) and satellite lines whose origin are related to spin coupling of 3p and 3d electrons and ligand type. Although changes in Mn–Kb spectra and its relation with the chemical environment has been quite studied in the last decades [1-5], synchrotrons and the development of high resolution spectrometers allows to improve the information quality obtained about absorption and emission process. In Mn–compounds, with unpaired 3d electrons, the Kb emission is split into a doublet composed of the main Kb1;3 line and a less intense , low energy Kb0 satellite. At the high energy side of the main line, the satellite line Kb00 (traditionally called "cross-over" transitions) can be observed. The Kb00 relative position respect to Kb5 contains information about the ligand type, and its intensity is related to the number of ligand atoms and its bond length. The Kb5 band arises from transitions that fills the 1s atomic orbital from molecular orbitals (MO) with electronic population of metal 3p and/or 4p and ligand 2p or 2s. Kb5 line shifts can be used to determine the oxidation state [4]. In this work, Kb emission spectra of manganese compounds with different oxidation states are analyzed in order to characterize the dependence of energy lines and intensities with oxidation state, net spin in the valence band and ligand type. In this work, Kb emission spectra of manganese compounds with different oxidation states are analyzed in order to characterize the dependence of energy lines and intensities with oxidation state, net spin in the valence band and ligand type. In this work, Kb emission spectra of manganese compounds with different oxidation states are analyzed in order to characterize the dependence of energy lines and intensities with oxidation state, net spin in the valence band and ligand type. In this work, Kb emission spectra of manganese compounds with different oxidation states are analyzed in order to characterize the dependence of energy lines and intensities with oxidation state, net spin in the valence band and ligand type. b spectra consist of main lines (Kb1;3, Kb5) and satellite lines whose origin are related to spin coupling of 3p and 3d electrons and ligand type. Although changes in Mn–Kb spectra and its relation with the chemical environment has been quite studied in the last decades [1-5], synchrotrons and the development of high resolution spectrometers allows to improve the information quality obtained about absorption and emission process. In Mn–compounds, with unpaired 3d electrons, the Kb emission is split into a doublet composed of the main Kb1;3 line and a less intense , low energy Kb0 satellite. At the high energy side of the main line, the satellite line Kb00 (traditionally called "cross-over" transitions) can be observed. The Kb00 relative position respect to Kb5 contains information about the ligand type, and its intensity is related to the number of ligand atoms and its bond length. The Kb5 band arises from transitions that fills the 1s atomic orbital from molecular orbitals (MO) with electronic population of metal 3p and/or 4p and ligand 2p or 2s. Kb5 line shifts can be used to determine the oxidation state [4]. In this work, Kb emission spectra of manganese compounds with different oxidation states are analyzed in order to characterize the dependence of energy lines and intensities with oxidation state, net spin in the valence band and ligand type.b emission spectra of manganese compounds with different oxidation states are analyzed in order to characterize the dependence of energy lines and intensities with oxidation state, net spin in the valence band and ligand type.