所有这些影响都会妨碍电子和空穴去继续它们作为准自由粒子的稳定运动，而引起散射。
All these prevent the electrons and holes from continuing their steady motion as quasi-free particles, and introduce scattering.
基极中空穴的密度小于发射极和集电极中自由电子的密度。
The density of holes in the base is less than the density of free electrons in the emitter and collector .
实验表明，在未经光照的卤化银乳剂微晶体中存在着一定量的自由电子和空穴，这些因素为灰雾中心的形成提供了必要的条件。
As proved by the experiments, a number of free electrons and holes are existed in the unexposed silver halide emulsion micro-crystals. These factors are all essential to the fog center formation.
应用推荐