费米黄金规则 dP2丌|F k mk mk SEm-( tha For emission E mk 2m上m8 (Ek -)费米黄金规则 [ ( )] 2 [ ( )] 2 2 2               = − − = = − + m k E m k m k m k A m k m k m k F w For emission F dt dP w