camtec nanofabrication workshop electron sources 1 what is the main idea of sem 2 electron gun 3 how is a fine electron bean formed 4 haw can we obtain an ...
Filetype Power Point PPTX | Posted on 09 Sep 2022 | 3 years ago
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...Camtec nanofabrication workshop electron sources what is the main idea of sem gun how a fine bean formed haw can we obtain an even finer kinds guns are used in differences between electrons configuration scanning microscope type that produces images with focused beam interact sample located either at very top region generates mechanism emits form metal and accelerates them strong electric field generation by source diameter do reduced made into dk condenser lens objective order to instrument utilizes featuring small large current density cm per unit area energy width vitiating ev discharged why important simplest cheapest uses heated tungsten wire produce kind there three types according method emission fe schottky thermal thermionic apply create filament usually which electrical pull away from has high melting point atoms cold lab lanthanum hexaboride...