Self-reversal

{
  "id": "MLC-T-CHM-010714",
  "term": "Self-reversal",
  "field": "Chemistry",
  "definition": "A phenomenon in atomic emission spectroscopy where the intensity of a spectral line decreases at its center due to absorption by cooler, non-emitting atoms in the outer regions of the light source. This effect leads to a dip in the emission profile, making the line appear broader or even split. It is particularly noticeable with high concentrations of the emitting species.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "self-absorption",
    "wavelength"
  ],
  "references": [
    "Orange Book, 2nd ed., p. 122 (https://media.iupac.org/publications/analytical_compendium/)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/self-reversal/"
}