| Abstract: | Tc L3‐edge XANES spectra have been collected on powder samples of SrTcO3 (octahedral Tc4+) and NH4TcO4 (tetrahedral Tc7+) immobilized in an epoxy resin. Features in the Tc L3‐edge XANES spectra are compared with the pre‐edge feature of the Tc K‐edge as well as other 4d transition metal L3‐edges. Evidence of crystal field splitting is obvious in the Tc L3‐edge, which is sensitive to the coordination number and oxidation state of the Tc cation. The Tc L3 absorption edge energy difference between SrTcO3 (Tc4+) and NH4TcO4 (Tc7+) shows that the energy shift at the Tc L3‐edge is an effective tool for studying changes in the oxidation states of technetium compounds. The Tc L3‐edge spectra are compared with those obtained from Mo and Ru oxide standards with various oxidation states and coordination environments. Most importantly, fitting the Tc L3‐edge to component peaks can provide direct evidence of crystal field splitting that cannot be obtained from the Tc K‐edge. |
