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).
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.
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.
Definition of electron beam in US English:
electron beam
noun
Physics
A stream of electrons in a gas or vacuum.
〔物理〕电子束，电子注
Example sentencesExamples
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.
Finally we stained the sample, attaching heavy-metal ions to increase its electron density in the electron beam.
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.
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).
This random emission of photons leaves the resulting electron beam with a fuzzy, rather than a sharply defined focus.