Term: self-absorption
https://doi.org/10.1351/goldbook.S05578

Definition:
Occurs in emission sources of finite thickness when radiant energy quanta emitted by atoms (or molecules) are absorbed by atoms of the same kind present in the same source. The absorbed energy is usually dissipated by collisional transfer of energy, or through emission of radiant energy of the same or other frequencies. In consequence, the observed radiant intensity of a spectral line (or band component) emitted by a source may be less than the radiant intensity would be from an optically thin source having the same number of emitting atoms. Self-absorption may occur in all emitting sources to some degree, whether they are homogeneous or not.

Related Terms:
1) radiant energy (http://doi.org/10.1351/goldbook.R05039).
2) radiant intensity (http://doi.org/10.1351/goldbook.R05045).

Source: Orange Book, 2nd ed., p. 242 (https://media.iupac.org/publications/analytical_compendium/)

Citation: 'self-absorption' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S05578

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