CsCl和CsBr中自陷态激子的研究  

A Study of the Self trapped Excitons in CsCl and CsBr

作　　者：张玉萍[1] 陈凌孚[1] 

机构地区：[1]南京师范大学物理系

出　　处：《南京师大学报（自然科学版）》1997年第2期39-43,共5页Journal of Nanjing Normal University(Natural Science Edition)

摘　　要：在单电子Ｈａｒｔｒｅｅ－Ｆｏｃｋ近似的基础上采用扩展离子方法研究了ＣｓＣｌ型晶体中自陷态激子（ＳＴＥ）的结构，研究表明ＣｓＣｌ中三重态ＳＴＥ的位形是较强的ｏｆ－ｃｅｎｔｅｒ，ＣｓＢｒ中三重态ＳＴＥ的位形是较弱的ｏｆ－ｃｅｎｔｅｒ，ＣｓＢｒ中单重态ＳＴＥ的位形是ｏｎ－ｃｅｎｔｅｒ．On the basis of one-electron Hartree-Fock approximation,the extended-ion method has been used to investigate the structure of self-trapped exciton in CsCl-type crystals.The results show that the triplet structure of STE in CsCl is strong off-center,the triplet structure of STE in CsBr is weak off -ceater,and the singlet structure of STE in CsBr is on-center.The results of the luminescence energies of the STE are in good agreement with the experimental results.

关 键 词：自陷态激子 离子晶体 溴化铯 氯化铯 激子 

分 类 号：O614.115[理学—无机化学] O741.3[理学—化学]