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Electron gun


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Any reasonably thick chunk of matter will absorb and distort an electron beam. You can get some electrons to pass through a very thin sample. I am not sure how you are going to slice water that thin. Ice perhaps? Or a film of water between 2 ultra thin coverslips?

 

Electron beams microscope sample chambers are in a hard vacuum. Remember that liquids can't exist in vacuums.

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