An unconventional method for measuring the Tc L-3-edge of technetium compounds

作者：Blanchard Peter E R; Reynolds Emily; Kennedy Brendan J^*; Ling Chris D; Zhang Zhaoming; Thorogood Gordon; Cowie Bruce C C; Thomsen Lars

来源：JOURNAL OF SYNCHROTRON RADIATION, 2014, 21(6): 1275-1281.

DOI：10.1107/S1600577514014891

• XANES
• Tc L-3-edge
• technetium oxides
• radioactive materials
• crystal field splitting

Tc L-3-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 L-3-edge XANES spectra are compared with the pre-edge feature of the Tc K-edge as well as other 4d transition metal L-3-edges. Evidence of crystal field splitting is obvious in the Tc L-3-edge, which is sensitive to the coordination number and oxidation state of the Tc cation. The Tc L-3 absorption edge energy difference between SrTcO3 (Tc4+) and NH4TcO4 (Tc7+) shows that the energy shift at the Tc L-3-edge is an effective tool for studying changes in the oxidation states of technetium compounds. The Tc L-3-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 L-3-edge to component peaks can provide direct evidence of crystal field splitting that cannot be obtained from the Tc K-edge.

• 出版日期2014-11