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本文测定了五磷酸铽单晶在77K下的偏振荧光光谱和红外吸收光谱。根据这些光谱,~5D_4,~7F多重态的能级结构以及跃迁归属已被确认。从X光结构分析的结果,该晶体中Tb~(3+)离子与八个近邻的氧原子相配位,呈稍歪扭的正方反棱柱体。换句话说,在TbP_5O_(14)中Tb_(3+)离子的局部对称性属于C_(4v)。按该对称性,利用配位场理论所做的计算与实验观察的~7F_J(J=0—6)多重态的Stark分裂得到了相当好的符合。其结果是,均方根差为8.4cm~(-1),最大偏差为17cm~(-1)。
In this paper, the polarization fluorescence spectra and infrared absorption spectra of terbium pentaphosphate single crystals at 77K were measured. Based on these spectra, the energy level structure of ~ 5D_4, ~ 7F multiplet states and transition assignments have been confirmed. From the result of X-ray structure analysis, Tb ~ (3+) ions in this crystal are coordinated with eight adjacent oxygen atoms, showing slightly twisted square antiprism. In other words, the local symmetry of Tb_ (3+) ions in TbP_5O_ (14) belongs to C_ (4v). According to the symmetry, Stark splitting of ~ 7F_J (J = 0-6) multiplet using the calculations of the ligand field theory and experimentally observed a good agreement. As a result, the root mean square difference was 8.4 cm -1, and the maximum deviation was 17 cm -1.