| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024fluo•res•cence /flʊˈrɛsəns, flɔ-/USA pronunciation n. [uncountable]- Chemistry, Physicsthe giving off of radiation, esp. of visible light, by a substance exposed to light or x-rays.
- Chemistry, Physicsthe radiation so produced.
fluo•res•cent, adj. See -flu-. WordReference Random House Unabridged Dictionary of American English © 2024fluo•res•cence (flŏŏ res′əns, flô-, flō-),USA pronunciation n. [Physics, Chem.]- Chemistry, Physicsthe emission of radiation, esp. of visible light, by a substance during exposure to external radiation, as light or x-rays. Cf. phosphorescence (def. 1).
- Chemistry, Physicsthe property possessed by a substance capable of such emission.
- Chemistry, Physicsthe radiation so produced.
- fluor(spar) + -escence, on the model of opalescence, in reference to the mineral's newly discovered property 1852
Collins Concise English Dictionary © HarperCollins Publishers:: fluorescence /ˌflʊəˈrɛsəns/ n - the emission of light or other radiation from atoms or molecules that are bombarded by particles, such as electrons, or by radiation from a separate source. The bombarding radiation produces excited atoms, molecules, or ions and these emit photons as they fall back to the ground state
- such an emission of photons that ceases as soon as the bombarding radiation is discontinued
- the radiation emitted as a result of fluorescence
Compare phosphorescence
Etymology: 19th Century: fluor + -escence (as in opalescence) |