Preferred Label : self-absorption;
IUPAC 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.;
Origin ID : S05578;
Automatic exact mappings (from CISMeF team)
- See also
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.
