Emission of a longer wavelength radiation by a substance as a consequence of absorption of energy from a shorter wavelength radiation, continuing only as long as the stimulus is present; distinguished from phosphorescence, which emission persists for a perceptible period of time after the stimulus has been removed. See photoelectric effect. [fluorspar + -escence, inchoative suffix]

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flu·o·res·cence -'es-ən(t)s n luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usu. at a different wavelength and that ceases almost immediately when the incident radiation stops also the radiation emitted
flu·o·res·cent -'es-ənt adj

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the emission of light by a material as it absorbs radiation from outside. The radiation absorbed may be visible or invisible (e.g. ultraviolet rays or X-rays).
fluorescent adj.

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flu·o·res·cence (fl-resґəns) [first observed in fluorspar] the property of emitting light while exposed to light, the wavelength of the emitted light being only slightly longer than that of the light absorbed. Cf. phosphorescence.

Medical dictionary. 2011.

Look at other dictionaries:

  • fluorescence — [ flyɔresɑ̃s ] n. f. • 1856; mot angl. (1852), de fluor, d apr. phosphorescence ♦ Phys. Luminescence d une substance (solide, liquide ou gaz) due à une transition spontanée des molécules, d un état excité vers l état fondamental. Fluorescence… …   Encyclopédie Universelle

  • Fluorescence — Flu o*res cence, n. [From {Fluor}.] (Chemistry, Optics) A luminescence emitted by certain substances due to the absorption of radiation at one wavelength, and the almost instantaneous re emission of radiation at another, usually longer wavelength …   The Collaborative International Dictionary of English

  • fluorescence — 1852, glowing in ultraviolet light, coined by English mathematician and physicist Sir George G. Stokes (1819 1903) from fluorspar (see FLUORINE (Cf. fluorine)), because in it he first noticed the phenomenon, + ESCENCE (Cf. escence), on analogy of …   Etymology dictionary

  • fluorescence —  Fluorescence  Флуоресценция   Кратковременная люминесценция. Излучательный переход между двумя состояниями одинаковой мультиплетности (синглетными или триплетными уровнями). Флуоресценция наблюдается в жидкой, твердой и газовой фазах. При… …   Толковый англо-русский словарь по нанотехнологии. - М.

  • fluorescence — ► NOUN 1) light emitted by a substance when it is exposed to radiation such as ultraviolet light or X rays. 2) the property of emitting light in this way. ORIGIN from FLUORSPAR(Cf. ↑F) (which fluoresces), on the pattern of opalescence …   English terms dictionary

  • fluorescence — [flo͞o΄ə res′əns] n. [< FLUOR(SPAR) + ESCENCE] 1. the property of a substance, such as fluorite, of producing light while it is being acted upon by ultraviolet rays, X rays, or other forms of radiant energy 2. the production of such light 3.… …   English World dictionary

  • Fluorescence — Fluorescent minerals emit visible light when exposed to ultraviolet light Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength.[1] It is a form of luminescence.… …   Wikipedia

  • Fluorescence X — Spectrométrie de fluorescence X Pour les articles homonymes, voir SFX, FX et XRF. Un spectromètre de fluorescence X Philips PW1606 avec manutention automatiq …   Wikipédia en Français

  • Fluorescence — La fluorescence est une émission lumineuse provoquée par l excitation d une molécule (généralement par absorption d un photon) immédiatement suivie d une émission spontanée. Ce processus est différent de la phosphorescence. La fluorescence peut… …   Wikipédia en Français

  • fluorescence — /floo res euhns, flaw , floh /, n. Physics, Chem. 1. the emission of radiation, esp. of visible light, by a substance during exposure to external radiation, as light or x rays. Cf. phosphorescence (def. 1). 2. the property possessed by a… …   Universalium

  • fluorescence — (flu o rè ssan s ) s. f. Terme de physique. Éclairement particulier que présentent certaines substances lorsqu elles sont exposées à l action des parties les plus réfrangibles de la radiation lumineuse, c est à dire à l action des rayons… …   Dictionnaire de la Langue Française d'Émile Littré

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