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Low Vac SEM

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Mania28:
Hi,

I would like to know how a Low Vacuum (not low voltage) SEM works. Why needn´t the sample be sputtered?

P:

In the same way an optical mic would look at reflected light  -  the SEM looks at reflected electrons - the sample needs to be coated so that it will reflect the electrons.     :)    They usually use a fine layer of gold or platinum I believe.

Mania28:
In Low Vac SEM, the Sample needn´t be coated. That´s why I want to know the trick behind this.

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