| 单词 | molecular beam |
| 释义 | > as lemmasmolecular 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. < as lemmas |
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