| NOUN | phenomenon | particle beam | a collimated flow of particles (atoms or electrons or molecules) |
|---|
| Meaning | A collimated flow of particles (atoms or electrons or molecules). | |
|---|---|---|
| Narrower | ion beam, ionic beam | A beam of ions moving in the same direction at the same speed |
| Broader | beam, ray, electron beam | A group of nearly parallel lines of electromagnetic radiation |
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