如果只允许透射束通过物镜光栏成像，称其为明场像；如果只允许某支衍射束通过物镜光栏成像，则称为暗场像。
纳观尺度上的TEM明场像和暗场像表明接头界面存在扩散分层现象；
In nano-scale, the interfacial layered structures were observed on TEM bright field images (BFI) and dark field images (DFI);
电子显微镜明场像显示，汞没有在金的表面上形成均匀的吸附层，部份金膜 与汞反应形成颜色较暗的岛状合金。
Under TEM images, it was found that Hg didn't form a uniform adsorption layer on Au surface. Some portions of Au film reacted with Hg and became dark island-shaped alloys.
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