摘要
关于立方Cs_2NaLnCl_6基质中Pr~(3+)的光谱性质的研究.近年来人们往往认为pr~(3+)在该基质中的对称是O_h晶位,但这种模型仅在温度较高时能很好地解释观测现象,而对较低温度时测定的光谱,便产生了很大的偏差.本文指出了在低温下(如T=4.2K)Cs_2NaLnCl_6基质中Pr~(3+)的晶格对称应为C_(h).我们采用中间耦合方案,考虑了晶场、组态、旋轨等相互作用,所得计算结果很好地解释了这一实验观测现象,从而证明了该模型C4h对称的正确性.
As for the research in the spectrum for Pr~(3+) in the cubic Cs_2NaLnCl_6 host, Pr~(3+) is usually considered as the Oh site symmetry in this host in recent years. This model can explain the phenomenon of the observation of the experiment only at the high temperature. Whereas at the low temperature (e. g. T=4.2K) the symmetry of the Pr~(3+) in the cubic Cs_2NaLnCl_6 host should be C4h. This paper adopts the intermediate-field coupling,takes into consideration of the interactions of crystal field, configuration and spin-orbit. The calculated consequence gives a reasonable explanation to this experiment, and proves the correctness of the C4h site symmetry.
