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外逸电子是固体表面受外界的机械作用或者自身的物理化学变化而产生的一种低能电子(其能量仅为一个电子伏特左右)。它的英文名称是“exoelectron”。由于是德国人Kramer所发现,外逸电子又被称作“Kramer”电子。发射外逸电子的物理现象称为“Kramer”效应。为了技术上的需要,用热、光或其它能量激发能大大提高外逸电子的发射率,这时的外逸电子发射称作热激外逸电子发射(TSEE)和光激外逸电子发射(PSEE)等。
Extrinsic electrons are a kind of low-energy electrons (the energy is only about one electron volt) generated by the external mechanical action or the physical and chemical changes of the solid surface. Its English name is “exoelectron.” Because it was discovered by the German Kramer, Ectopic electrons are also called “Kramer” electrons. The physical phenomenon of emitting electrons is called the “Kramer” effect. For technical reasons, thermal emanation of light, or other energetic energies, can greatly increase the emissivity of extrinsic electrons, which are referred to as TSEE and PSEE )Wait.