2-13 =T(4)-7(4p) 3d1 =T(3s)-7(4p) P 3-7n)-7(4p) =T(3p)-T(4s) =T(3p)-T(3) 3s 选择定则 △l=±1 =T(3s)-T(3p)选择定则 3d 3p 3s 4s 4p 2-13 (4 ) (4 ) 1 1 = T s −T p  (3 ) (4 ) 1 2 = T s −T p  (3 ) (4 ) 1 3 = T d −T p  (3 ) (4 ) 1 4 = T p −T s  (3 ) (3 ) 1 5 = T p −T d  (3 ) (3 ) 1 6 = T s −T p 