)二次电子
二次电子
Secondary electron
入射电子与样品核外电子碰撞，使样品表面的核外电子被激发出来的电子，是作为SEM的成像信号，代表样品表面的结构特点。
A secondary electron arises as a result of the interaction of a primary electron with a specimen. In principle the term refers to all electrons emitted from a specimen after it has been bombarded with primary electrons, X-rays or other radiation. In practice the phrase most commonly refers to low-energy electrons (kinetic energy less than 50eV) emitted from the specimen in a scanning electron microscope (SEM).
