5p→ 3d X-Ray Emission Spectra under the X-Ray Excitation in LaF₃, La₂O₃ and CeF₃

Abstract

X-ray emission spectra (XES) due to the 5p→ 3d electronic transition in LaF₃, La₂O₃ and CeF₃ are investigated by the X-ray excitation and the electron bombardment. Strong variation in the shape of XES in these compounds is observed in the X-ray excitation. It is shown by a theoretical analysis that this variation is mainly due to the difference of the hybridization effect in the excited state with a 3d core hole. In the electron bombardment, the spectral features are not so much changed among these compounds as in the X-ray excitation, because the 3d4fⁿ⁺¹ configuration created by the 3d→ 4f direct excitation hardly hybridizes with the 3d4 fⁿ⁺²\underline{L} configuration.