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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. Generation of luminescence through excitation of a molecule by ultraviolet or visible light photons is a phenomenon termed photoluminescence, which is formally divided into two categories, fluorescence and phosphorescence, depending upon the electronic configuration of the excited state and the emission pathway. Fluorescence is the property of some atoms and molecules to absorb light at a particular wavelength and to subsequently emit light of longer wavelength after a brief interval, termed the fluorescence lifetime. The process of phosphorescence occurs in a manner similar to fluorescence, but with a much longer excited state lifetime. Fundamental Aspects of Fluorescence Microscopy - The modern fluorescence microscope combines the power of high performance optical components with computerized control of the instrument and digital image acquisition to achieve a level of sophistication that far exceeds that of simple observation by the human eye. Microscopy now depends heavily on electronic imaging to rapidly acquire information at low light levels or at visually undetectable wavelengths, as discussed in this Nikon MicroscopyU review article. These technical improvements are not mere window dressing, but are essential components of the light microscope as a system. http://micro.magnet.fsu.edu/primer/techniques/fluorescence/fluorhome.html 

 
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Keywords
microscopy  
 
 About This Video
 
 Subject Physics
 Category [var.category]
 Duration 00:01:02
 Views 3135
 Added 26-12-07
 Contributor    quantum
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