在低温,仅充填~3Po 态的条件下,CaF_2中 Pr~(3+)的激光激发伴有几条发射线。超过了预料的 ~3Po→~3H_(4,5,6);~3F_2,3,射跃迁的最大数目。仅在室温下才观察到 Pr~3r 的~3P_1态发出荧光。发射带的强度和分裂以及它们的浓度依赖关系表明,由于 Pr~3r 格点不同,有三种可能的发射线族。Ⅰ族(能量最低)由几条弱发射线组成,电～ Under the condition of low temperature and only ~ 3Po filling, the laser excitation of Pr ~ (3 +) in CaF_2 is accompanied by several emission lines. Exceeds the expected ~ 3Po → ~ 3H_ (4,5,6); ~ 3F_2,3, the maximum number of jets transition. The ~ 3P 1 state of Pr ~ 3r was observed to fluoresce only at room temperature. The intensity and split of the emission bands and their concentration dependencies indicate that there are three possible emission line families due to the different lattice points of Pr ~ 3r. I (the lowest energy) consists of several weak emission lines, electricity ~