STARK ENERGY LEVELS OF ~5D_4,~7F_J(J=0—6)OF Tb~(3+) IONS IN TbP_5O_(14)

• 作 者: 白玉白 汤卓然 赵永年 李铁津
• 机 构: Department of Chemistry, Jilin University, Changchun,Department of Chemistry, Jilin University, Chan
• 出 处: Science in China,Ser.B
• 发表日期: 1988年03期
• 关键词: deviation symmetry Stark belongs distorted polarized slightly transitions infra

In the present paper, the polarized fluorescence spectra and the infrared absorptionspectra of single crystals of terbium pentaphosphate, TbP_5O_(14), were measured at 77 K. Most ofthe observed transitions were identified and the energy level structure of the ~7F multipletwas also defined. The result of structure analysis indicates that the coordination of the cationto oxygen atoms is eightfold with the geometry of a slightly distorted square antiprism. In otherwords, the local symmetry of the Tb~(3+) in TbP_5O_(14) belongs to C_(4v). The crystal field calculationswere performed for such symmetry and gave a respectable fit for the observed Stark splittingof the ~7F_J (J = 0--6) multiplet. The comparison between the experimental and the calculatedenergy levels shows that the rms deviation and the maximum deviation are 8cm~(-1) and 17cm~(-2),respectively.