Abstract
The emission of an electromagnetic wave by gases, liquids or solids is caused by the transformation of energy within matter. The origins of the phenomena are:
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thermal radiation (or incandescence) associated with the thermal movement of particles (atoms, molecules, ions) and, by definition, is only dependent on the temperature;
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luminescence for all other causes other than those associated with a thermal state. The mechanisms for these are varied, noting in particular: triboluminescence of mechanical origin, chemiluminescence with a chemical origin, electroluminescence with electrical origin, cathodoluminescence produced by the impact of electrons on a target, bioluminescence of organic origin, radioluminescence observed after the absorption of α or β particles and photoluminescence after photon absorption... Depending on the time constant, we distinguish between fluorescence and phosphorescence: in the former case the emission follows immediately after the excitation (τ < 10 ns) and in the latter case, it is delayed and lasts longer.
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© 1999 Springer Science+Business Media New York
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Caniou, J. (1999). Radiation sources. In: Passive Infrared Detection. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-6140-5_4
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DOI: https://doi.org/10.1007/978-1-4757-6140-5_4
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