Page "Fluorescence" Paragraph 29
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It is similar to a first-order chemical reaction in which the first-order rate constant is the sum of all of the rates ( a parallel kinetic model ).
For commonly used fluorescent compounds, typical excited state decay times for photon emissions with energies from the UV to near infrared are within the range of 0. 5 to 20 nanoseconds.
The fluorescence lifetime is an important parameter for practical applications of fluorescence such as fluorescence resonance energy transfer and Fluorescence-lifetime imaging microscopy.
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