FLUORESCENCE

Fluorescence

Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation. The emitted radiation may also be of the same wavelength as the absorbed radiation, termed "resonance fluorescence".

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fluorescence

Noun

  1. The emission of light (or other electromagnetic radiation) by a material when stimulated by the absorption of radiation or of a subatomic particle
  2. The light so emitted


The above text is a snippet from Wiktionary: fluorescence
and as such is available under the Creative Commons Attribution/Share-Alike License.

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