极度怀疑,
1 个人觉得束斑大了分辨率肯定差。。。。。。即使束流密度再大也会差的,一个检验的办法就是,同样用冷场电镜,在高放大倍数下用大的束斑肯定也是有问题的,
The secondary electron emission, confined to a very small volume near the beam impact area for certain choices of the beam energy, permits images to be obtained at a resolution approximating the size of the focused electron beam. (page 1, Joseph goldstein, etc, Scanning Electron Microscopy and X-ray Microanalysis, 3rd edition)
2 为什么一定在8mm工作距离在拍高倍,而不是在18mm,或是1mm呢,这条件限制怪怪的
3 楼主如果计算出能量过滤的束流损失在95%,我一直想算这个,没办法算,很想知道具体的计算过程。。。