molecular beam

molecular beam

 
noun Physics.
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.
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Also called molecular ray.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Molecular beam is always a great word to know.
So is half-life. Does it mean:
the time required for one half the atoms of a given amount of a radioactive substance to disintegrate
a photon of penetrating electromagnetic radiation emitted from an atomic nucleus; electromagnetic radiation with wavelengths shorter than 1/10 of a nanometer
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Collins
World English Dictionary
molecular beam or molecular ray
 
—n
physics a parallel beam of molecules that are at low pressure and suffer no interatomic or intermolecular collisions
 
molecular ray or molecular ray
 
—n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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