Analytical Sciences

Chemical Effects of CeL_γ4 Emission Spectra for Ce Compounds

Hisashi HAYASHI,* Yuki TAKEHARA,* Naomi KAWAMURA,** and Masaichiro MIZUMAKI**

*Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, 2-8-1 Mejirodai, Bunkyo, Tokyo 112-8681, Japan
**SPring-8, JASRI, 1-1-1 Kouto, Sayo-cho, Sayo, Hyogo 679-5198, Japan

High-resolution CeL_γ4 emission spectra of CeF₃, Ce₂S₃, CeF₄, and CeO₂ have been measured using a multicrystal, multidetector spectrometer. The spectra exhibited substantial differences depending on the chemical environment of the Ce ions. By comparing the observed CeO₂ spectrum with the band calculations, we determined that the observed chemical effects of the main emission line were primarily attributable to the transitions of the Ce5p band; the high-energy tail at around 6.539 keV was assigned to the ligand p→Ce2s cross transition. Further, a key difference between CeL_γ4 and EuL_γ4 is discussed with reference to CeL₁- and EuL₁-X-ray absorption fine-structures (XAFS). Possible applications of CeL_γ4 emissions to material characterization are also suggested.

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