非简并微扰 最简单情形 E.≠ 扩f m≠n Suppose system is in state pu before perturbation 0) mk k
非简并微扰 ◼ 最简单情形 k m m k k m n E c before perturbation Suppose system is in state if m n = = (0) (0)
一阶修正 (0) 今(米(0)C)+c*1)(0)=0么 E (1)A(0) +e ∑ k mk ≠ k k
一阶修正 m k w c E W c c c c E c E c c W c k m m k m kk m m m m m n m m m m n m n − = = + = + − = , ( * * ) 0 : (1) (1) (0) (1) (1) (0) (1) (0) (0) (1) (1) (0) 1