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单词 molecular beam
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molecular beam
molecular beam n. Physics a narrow directed beam of molecules, ions, or atoms.
ΚΠ
1955 C. H. Townes et al. in Physical Rev. 15 Aug. 1264/1 [Announcing the laser, then called a maser] The device utilizes a molecular beam in which molecules in the excited state of a microwave transition are selected.
1992 Sci. Amer. Nov. 94/2 The ingenious apparatus can record chemical identifications within tens of femtoseconds by use of ultrashort laser pulses, collisionless, polarized molecular beams, and well-timed pulse manipulation.
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