off-diagonal element

The Collisions produces two effets on atoms : the atoms transition or the random shift δω( t ) of the levels , in thio paper , we prove that the δω( t ) leads to lifetime effects on the off-diagonal element ρ _ ( ab ) .

碰撞对原子产生两种效应：原子跃迁或原子能级的随机移位δω（t），本文证明δω（t）导致密度矩阵非对角元p（ab）的寿命效应。