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fluorescence    
n. 荧光,发荧光,荧光性

荧光,发荧光,荧光性

fluorescence
萤光

fluorescence
n 1: light emitted during absorption of radiation of some other
(invisible) wavelength

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 re-radiation stops almost as soon as
the incident radiation is halted, thus distinguishing this
phenomenon from {phosphorescence}, in which re-radiation of
light may continue for some time after the incident radiation
is halted.

Note: The color of the radiated light typically differs from
the apparent color 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 has
of modifying the light incident upon it, by first
absorbing the light to achieve an excited state, and
then radiating light to resume the ground energy level.
The light emitted by fluorescent substances is in
general of longer wavelength than the incident light.
The radiation can also be induced by ionizing radiation
which is not electromagnetic, such as alpha or beta
rays, and cathode rays. This property is possessed by
fluorspar, uranium glass, sulphide of calcium, and many
other substances. It finds use in analytical
instruments to detect or measure radiation, and in some
commercial applications.
[1913 Webster PJC]


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  • Fluorescence - Wikipedia
    Fluorescence has many practical applications, including mineralogy, gemology, medicine, chemical sensors (fluorescence spectroscopy), fluorescent labelling, dyes, biological detectors, cosmic-ray detection, vacuum fluorescent displays, and cathode-ray tubes
  • Fluorescence Definition and Examples - Science Notes and Projects
    Fluorescence is a phenomenon where certain materials rapidly (around 10 -8 seconds) emit light when they are exposed to specific types of electromagnetic radiation, typically ultraviolet (UV) light
  • Fluorescence - Chemistry LibreTexts
    Fluorescence occurs when an atom or molecules relaxes through vibrational relaxation to its ground state after being electrically excited The specific frequencies of excitation and emission are dependent on the molecule or atom
  • Fluorescence | Emission, Excitation Photochemistry | Britannica
    Fluorescence, emission of electromagnetic radiation, usually visible light, caused by excitation of atoms in a material, which then reemit almost immediately (within about 10−8 seconds)
  • Microsoft Word - Fluorescence Excitation and Emission . . .
    Fluorescence is a member of the ubiquitous luminescence family of processes in which susceptible molecules emit light from electronically excited states created by either a physical (for example, absorption of light), mechanical (friction), or chemical mechanism
  • Fluorescence Microscopy Explained: A Beginner’s Guide
    What is Fluorescence? Fluorescence is a phenomenon where certain molecules absorb light at one wavelength (excitation) and emit it at a longer wavelength (emission) This shift is known as the Stokes shift* and is key to detecting specific structures within biological samples
  • FLUORESCENCE Definition Meaning - Merriam-Webster
    The meaning of FLUORESCENCE is luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a different wavelength and that ceases almost at once when the incident radiation stops; also : the radiation emitted





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