Interpretation of the 4f-5d Excitation Spectra of Eu3+ and Tb3+ Doped in Crystals
来源期刊：JOURNAL OF RARE EARTHS2006年第4期
论文作者：Xia Shangda Duan Changkui Chen Tao
Key words：f-d transition; the simple model; energy levels; transition intensities; Eu3+; Tb3+; rare earths;
Abstract: The structure of the low-temperature 4fN→4fN-15d excitation spectra of Eu3+ and Tb3+ doped in crystals LiYF4, YPO4 and CaF2 measured by van Pieterson et al. In 2002 was analyzed and assigned based on the simple model proposed by Duan and co-workers in the last few years. Some complemental discussion on effects of J-mixing on the f-d transition intensities for Eu3+ due to the f-electron crystal-field interaction Hcf(f), which was ignored in the simple model, was presented. Some previously unexplained peaks for Tb3+ were interpreted to be spin-forbidden transitions to higher 5d crystal-field levels, or assigned to be f→d excitations with the core 4f7 excited from 8S to 6P, 6I and 6D, respectively. It is shown that the main structure of 4f-5d excitation spectra of Eu3+ and Tb3+ can be well interpreted with the simple model.
Xia Shangda1，Duan Changkui1，Chen Tao2
(1.Institute of Modern Physics, Chongqing University of Post and Telecommunications, Chongqing 400065, China;
2.Department of Physics, University of Science and Technology of China, Hefei 230026, China)
Abstract:The structure of the low-temperature 4fN→4fN-15d excitation spectra of Eu3+ and Tb3+ doped in crystals LiYF4, YPO4 and CaF2 measured by van Pieterson et al. In 2002 was analyzed and assigned based on the simple model proposed by Duan and co-workers in the last few years. Some complemental discussion on effects of J-mixing on the f-d transition intensities for Eu3+ due to the f-electron crystal-field interaction Hcf(f), which was ignored in the simple model, was presented. Some previously unexplained peaks for Tb3+ were interpreted to be spin-forbidden transitions to higher 5d crystal-field levels, or assigned to be f→d excitations with the core 4f7 excited from 8S to 6P, 6I and 6D, respectively. It is shown that the main structure of 4f-5d excitation spectra of Eu3+ and Tb3+ can be well interpreted with the simple model.
Key words:f-d transition; the simple model; energy levels; transition intensities; Eu3+; Tb3+; rare earths;
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