Optical spectra of trivalent lanthanides in LiYF4 crystal |
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Authors: | K Ogasawara S Watanabe T Ishii H Ikeno |
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Institution: | a Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan b Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan c Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan |
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Abstract: | Systematic calculations of multiplet energy levels of all trivalent lanthanides in LiYF4 (YLF) crystal were performed using two completely different approaches: diagonalization of the commonly used semi-empirical Hamiltonian and a fully relativistic discrete-variational multi-electron (DV-ME) method which is based on a first-principles configuration-interaction (CI) calculation program using molecular spinors obtained by the discrete-variational Dirac-Slater (DV-DS) calculations. The energy level diagrams within 4fn electron configurations were obtained by the former method, while those including both 4fn and 4fn−15d1 configurations were obtained by the latter. Using the explicit many-electron wave functions, the absorption spectra of Pr3+, Ho3+, and Tm3+ in YLF were calculated and compared with the experimental data. |
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Keywords: | Trivalent lanthanides Multiplets Energy levels Dieke diagram First-principles calculation Configuration interaction |
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