10. Molecular fluorescence and scattering
Molecules can also emit radiation after being excited by an incident electromagnetic wave. If the incident radiation is absorbed during the process, the re-emitted light is said to fluoresce; on the other hand, when there is no absorption of the exciting radiation, the phenomenon is called scattering.
10.1 Molecular fluorescence
Molecular fluorescence can be observed in the gaseous, liquid or solid state (bromine or iodine vapors, organic compounds, laser dyes, etc.); however, molecular fluorescence can compete with non-radiative phenomena such as intersystem crossover, internal conversion or collisional relaxation. The phenomenon of molecular fluorescence corresponds to light emission, generally following the absorption of incident radiation by the substance...
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Molecular fluorescence and scattering
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