Occurs in emission sources of finite thickness when @R05039@ 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 @R05039@ of the same or other frequencies. In consequence, the observed @R05045@ of a spectral line (or band component) emitted by a source may be less than the @R05045@ 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.