fluorescence

instantaneous re-emission of light of a greater wave length than that light originally absorbed.

fluorescence

Emission of visible light by a substance, such as a mineral, that is currently exposed to ultraviolet light and absorbs radiation from it. The light appears in the form of glowing, distinctive colors. The emission ends when the exposure to ultraviolet light ends. Minerals describes as fluorescent have the ability to fluoresce.
Found on http://www.encyclo.co.uk/local/22291

Fluorescence

Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It also occurs when molecules are excited to higher electronic states by energetic electron bombardment, such as occurs, for example, in the natural aurora{what?|date=June 2014}, high-altitude nuclear explosions, and rocket-borne electr...
Found on http://en.wikipedia.org/wiki/Fluorescence

fluorescence

the emission of visible light by a gemstone when exposed to a light source whose light we normally cannot see. When the gemstone is exposed to ultraviolet light (UV), which falls outside the range of light that we can see, the UV light is absorbed by the gemstone. Due to processes inside the gemstone, it will lose energy. This loss of energy cause...
Found on http://gemologyproject.com/wiki/index.php?title=Glossary_of_Terms

fluorescence

(fldbobr-res´әns) the property of emitting light while exposed to light, the wavelength of the emitted light being longer than that of the absorbed light. fluorescence microscopy the use of a fluorescence microscope to identify microorganisms or specific tissue constituents th...
Found on http://www.encyclo.co.uk/local/21001

fluorescence

(from the article `analysis`) ...the lower electron orbital without inverting its spin—i.e., without changing the direction in which the electron rotates in the presence of a ... ...(light of essentially one `colour`—i.e., composed of a very narrow range of frequencies). As the light is tuned across the frequency ran...
Found on http://www.britannica.com/eb/a-z/f/40

fluorescence

[n] - light emitted during absorption of radiation of some other (invisible) wavelength
Found on http://www.webdictionary.co.uk/definition.php?query=fluorescence

Fluorescence

• (n.) That property which some transparent bodies have of producing at their surface, or within their substance, light different in color from the mass of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the difference in the color of a distinct surface layer, but to the power which the substance ha...
Found on http://thinkexist.com/dictionary/meaning/fluorescence/

fluorescence

<chemistry, physics> The emission of one or more photons by a molecule or atom activated by the absorption of a quantum of electro magnetic radiation. ... Typically the emission, that is of longer wavelength than the excitatory radiation, occurs within 10exp 8 seconds: phosphorescence is a phenomenon with a longer or much longer delay in re r...
Found on http://www.encyclo.co.uk/local/20973

Fluorescence

Flu`o·res'cence noun [ From Fluor .] (Opt.) That property which some transparent bodies have of producing at their surface, or within their substance, light different in color from the mass of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the d...
Found on http://www.encyclo.co.uk/webster/F/49

Fluorescence

A fluorescent substance absorbs short wavelength radiation and re-emits it as radiation with a longe
Found on http://www.superglossary.com/Glossary/Science/Chemistry/

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.
Found on http://www.chemistry-dictionary.com/definition/fluorescence.php

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.
Found on http://www.encyclo.co.uk/local/20728

Fluorescence

Blue, yellow or white glow seen on a diamond when viewed in ultra-violet light or direct sunlight.
Found on http://www.allaboutgemstones.com/glossary_gemology.html

Fluorescence

Certain diamonds disperse a bluish glow when exposed to ultraviolet light. A diamond should not have strong fluorescence, but faint or moderate fluorescence does not affect the diamonds look. Some customers prefer a faint fluorescence, because it balances the yellow colour of some of the less expensive stones.
Found on http://www.encyclo.co.uk/local/22161

Fluorescence

Emission of light by a substance when some radiations fall on it.
Found on http://www.vidyagyaan.com/general-knowledge/basic-chemistry-element-terms-a

Fluorescence

Emission of light or other radiant energy as a result of and only during absorption of radiation fro
Found on http://www.superglossary.com/Glossary/Technology/Radar/

fluorescence

fluorescence (floores'uns) , luminescence in which light of a visible color is emitted from a substance under stimulation or excitation by light or other forms of electromagnetic radiation or by certain other means. The light is given off only while the stimulation continues; in this the phenome...
Found on http://www.infoplease.com/ce6/sci/A0818998.html

FLUORESCENCE

Fluorescence is the effect viewed when a diamond glows under ultra-violet light (UV). Some 50 percent of polished diamonds display fluorescence, most of them in a blue hue, but sometimes other colors, especially yellow, can be observed. When diamond displays relatively strong fluorescence, it can cause a diamond to look somewhat “hazy” and ther...
Found on http://www.translationdirectory.com/glossaries/glossary275.php

Fluorescence

Fluorescence is the process of emission of electromagnetic radiation resulting from the absorption of certain types of energy. Fluorescent paints are usually the sulphides of calcium, barium and strontium which glow in the dark after having been exposed to light for a while.
Found on http://www.probertencyclopaedia.com/browse/GF.HTM

fluorescence

fluorescent; fluorescent compound. A fluorescent substance absorbs short wavelength radiation and re-emits it as radiation with a longer wavelength in a very short time.
Found on http://antoine.frostburg.edu/chem/senese/101/glossary/f.shtml

fluorescence

Fluorite showing fluorescence under UV light A form of luminescence in which a substance emits visible light almost immediately after it has been stimulated or excited by electromagnetic radiation of a different wavelength or by certain other means (such as electrons striking the surface of a T...
Found on http://www.daviddarling.info/encyclopedia/F/fluorescence.html

Fluorescence

If a substance absorbs light at one wavelength and re-radiates it at another wavelength almost immediately, it is fluorescent; this is why many materials glow under ultraviolet light. If the substance keeps re-radiating light over a period of seconds, minutes, or hours, it is called phosphorescent.
Found on http://www.encyclo.co.uk/local/20046

FLUORESCENCE

is the general term used to describe the emission of 'cold' non incandescent light by a substance while it is being excited by radiation of shorter wavelength and higher energy.
Found on http://gemologyonline.com/gemology_dictionary.htm

fluorescence

luminescence observed only during irradiation NOTE - Luminescence is defined in 845-04-18.
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=394-38-60
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