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Gas focusing, also known as ionic focusing.
Additional recommended knowledge
Rather than being dispersed, a beam of charged particles travelling in an inert gas environment sometimes becomes narrower. This is ascribed to the generation of gas ions which diffuse outwards, neutralizing the particle beam globally, and producing an intense radial electric field which applies a radially inward force to the particles in the beam.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Gas_focusing". A list of authors is available in Wikipedia.|