1haz de electrones masculine
- Finally we stained the sample, attaching heavy-metal ions to increase its electron density in the electron beam.
- The electron beam starts at the top-left of the screen and magnetic fields are used to ‘sweep’ this beam across the screen in parallel horizontal lines (if you look closely at a tv screen you can see these lines).
- In the space between the flat type screen and the back electrode, linear cathodes and an electrode unit including an electron beam extracting electrode are arranged.
- This random emission of photons leaves the resulting electron beam with a fuzzy, rather than a sharply defined focus.
- Now we may be witnessing yet another radical reduction in size following the construction of an electron beam that measures just a few atoms across.