电偶极跃迁 h=ey=eE. x=-D. Eo cost D=ex(e<o) Absorption Wmk ( D Eo lEM -(Em +no) zelE 2h -mk/ cos20 STEm(Em +ho) 0=angle of(D,Eo) cos2O>=1/3电偶极跃迁 cos 1/ 3 ( , ) cos [ ( )] 2 ( ) [ ( )] 2 ( 0) ' cos 2 0 2 2 2 0 2 2 0 0  = = = − +   − + =  = = −  = −                 angle of D E x e E w D E Absorption D ex e H e eE x D E t m k m m m k m k m m               