bigbelly
第11楼2009/08/03
Spot size改变的是 first condenser lens 的强度
C1的作用是:
* Create a demagnified image of the gun crossover.
* Control the minimum spot size obtainable in the rest of the condenser system.
我说不明白,可以参考Tutorials in TEM, page34-35 http://www.instrument.com.cn/bbs/shtml/20090721/2013094/
还有http://www.matter.org.uk/tem/lenses/simulation_of_condenser_system.htm
有动画,一目了然