A molecular beam is produced by allowing a gas at higher pressure to expand through a small orifice into a chamber at lower pressure to form a beam of particles (atoms, free radicals, molecules or ions) moving at approximately equal velocities, with very few collisions between the particles. Molecular beam is useful for fabricating thin films in m...
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http://en.wikipedia.org/wiki/Molecular_beam
any stream or ray of molecules moving in the same general direction, usually in a vacuum—i.e., inside an evacuated chamber. In this context the word ... [3 related articles]
Found on
http://www.britannica.com/eb/a-z/m/109
a stream of molecules freed from a substance, usually a salt, by evaporation and then passed through a narrow slit for focusing, for investigating the properties of nuclei, atoms, and molecules. Also called
Found on
https://www.infoplease.com/dictionary/molecular-beam
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