自旋表象 (S2,S) 方/2 O O 方/2 S2=(+1)h2 22 o 1自旋表象         = +         − + = 0 1 1 0 1) 2 1 ( 2 1 0 / 2 / 2 0 ) ˆ , ˆ ( 2 2 2      S S S S z z