Chemical effects in high-resolution Kb spectrum in Mn compounds

S. LIMANDRI; G. TIRAO; S. CEPPI; G. STUTZ; J.A. RIVEROS

Campinas

Congreso; XVIII Reunión Anual de Usuarios del LNLS; 2008

LNLS

Kb spectrum (Kb´, Kb1;3, Kb" and Kb2;5 lines) in Mn metal and various Mncompounds was measured at the D12A-XRD1 beamline using an X-ray high res-olution spectrometer 1. The instrumental resolution at the Mn-Kb1;3 energy wascalculated to be 1.9 eV. This improved energy resolution allowed chemical effect induced enhancement and shift of emission lines to be examined with high accuracy.Relative intensity, linewidth and line shift were investigated in Mn compounds ex-hibiting different oxidation state (Mn0, MnII, MnIII, MnIV, MnVI, MnVII) anddifferent type of ligand atom (oxygen, fluorine, sulfur).It was found that the Kb2;5 and Kb´ energy related to the Kb1;3 is very sen-sitive to oxidation state. These parameters could be used to determine oxidationstates with an accuracy higher than using the Kb1;3 energy, as suggested by otherauthors [2,3]. The observed energy shift of the Kb´ line is in agreement with a pre-vious work [4]. In addition, some in°uence of the oxidation state on the Kb´ relativeintensity and linewidth has been observed. Kb" satellite line was measured to beshifted about several eV from the Kb2;5 line, depending on the type of ligand atomin the investigated Mn compounds, as previously found by Bergmann et al 5.The results found in this work prove that high resolution Kb fluorescence canbe considered as a good technique to characterize chemical environment.