单晶LiNbO_3:Mn^(2+)的ESR谱研究  

ESR study of the Mn^(2+) center in LiNbO_3

作　　者：侯碧辉[1] 李勇[2] 刘国庆[1] 张桂花[1] 刘凤艳[1] 陶世荃 

机构地区：[1]北京工业大学应用数理学院,北京100022 [2]清华大学化学系,北京100084

出　　处：《物理学报》2005年第1期373-378,共6页Acta Physica Sinica

基　　金：国家重点基础研究发展计划 (批准号:G19990 3 3 0 );国家自然科学基金(批准号 :699770 0 5 )资助的课题~~

摘　　要：用室温电子自旋共振 (ESR)实验研究单晶LiNbO3中Mn2 +的精细结构和超精细结构 .对ESR谱的分析得出 ,零磁场的能级分裂数值 :自旋角动量能级± 12 〉与± 32 〉之间的间隔为Δε1 =- 5 87× 10 - 4cm- 1 ,而± 32 〉与± 52 〉之间的能级间隔为Δε2 =- 2 6 33× 10 - 4cm- 1 ;其各向异性朗德因子g∥ =2 1810 ,g⊥ =2 0 937;精细结构常数D =- 5 36× 10 - 4cm- 1 ;超精细结构常数A∥ =88 36× 10 - 4cm- 1 ,A⊥ =81 2 0× 10 - 4cm- 1 ,即精细结构相互作用要比超精细结构相互作用大得多 .另外 ,特别值得提到的是实验中还发现两组明显的禁戒跃迁 ,- 32 〉 12 〉和- 12 〉 52 〉.Fine structure and hyperfine structure Mn2+ in LiNbO3 are analyzed with electron spin resonance (ESR) at room temperature. It is concluded that the zero-field splitting of enery levels of electron spin angular moment between \ +/-(1)/(2)> and \ +/- (3)/(2) > is Deltaepsilon(1) = -587 x 10(-4)cm(-1), and that between \ +/-(3)/(2) > and \ +/- (5)/(2) > is Deltaepsilon(2) = -2633 x 10(-4)cm(-1). The anisotropic Lande factors are g(//) = 2.1810, and g(perpendicular to)= 2.0937. The fine structure constant is D = -536 x 10(-4)cm(-1), and hyperfine structure constants are A(//) = 88.36cm(-1) and A(perpendicular to) = 81.20 x 10(-4)cm(-1). The interaction action of the fine structure is larger than that of the hyperfine structure. In addition, it is worth paying special attention to the fact that two forbidden transitions \ -(3)/(2) > <----> \ (1)/(2) > and \ -(1)/(2) > <----> \ (5)/(2) > are found.

关 键 词：超精细结构常数 ESR谱 能级分裂 自旋角动量 LiNbO3 MN^2+ 单晶 实验研究 电子自旋共振 发现 

分 类 号：O73[理学—晶体学]