scanning electron microscope (SEM), style of electron microscope, suitable for straight studying the surfaces of sound objects, that makes use of a beam of targeted electrons of relatively minimal Strength as an electron probe which is scanned in a daily fashion more than the specimen.

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The electron source and electromagnetic lenses that crank out and target the beam are just like All those explained to the transmission electron microscope (TEM). The action from the electron beam stimulates emission of higher-Electricity backscattered electrons and lower-Power secondary electrons through the surface on the specimen.

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电子束实际上不仅与样品表层原子发生作用，而是与一定厚度范围内的样品原子发生作用，所以存在一个作用体积。作用体积的厚度因信号的不同而不同：