c**r
发帖数: 2019 | 1 我记得好几年以前学电镜的时候老师是这样讲的：
在物体表面被直接反射回来的电子叫“一次电子”；
物体内部的因吸收了入射电子束的能量而被激发到空间中的电子叫“二次电子”。 |
M*********m
发帖数: 2024 | 2 Secondary electrons are Auger electrons and inelastic scattering electrons,
they are generated from different processes, but who knows what happens to
these identical particles. You can use time resolved spectrum to measure them.
【在 c**r 的大作中提到】
: 我记得好几年以前学电镜的时候老师是这样讲的：
: 在物体表面被直接反射回来的电子叫“一次电子”；
: 物体内部的因吸收了入射电子束的能量而被激发到空间中的电子叫“二次电子”。
|
g*****o
发帖数: 930 | 3 二次电子是相对入射电子而言的。俄些电子一般没听说叫
二次电子的。
对于SEM，样品中被即出的电站电子是二次电子，入射电子被反射
的叫北散射电子AUGER电子是样品原子辐射时的能量可以使更高层电子
激发。
【在 M*********m 的大作中提到】
: Secondary electrons are Auger electrons and inelastic scattering electrons,
: they are generated from different processes, but who knows what happens to
: these identical particles. You can use time resolved spectrum to measure them.
|
t*****r
发帖数: 2 | 4 Secondary electrons means those electrons undergoing inelastic scattering with
the solid and lost the character energy. For Auger electrons or electrons
produced in photoemission process, the emitting energy is well defined if no
inelastic scattering happens. However, if they have some inelastic scattering
when travelling through the sample, the kinetic energy then is not well
defined and they become secondary electrons. |
