Optical absorption depth

{
  "id": "MLC-T-CHM-008266",
  "term": "Optical absorption depth",
  "field": "Chemistry",
  "definition": "The distance within a material at which the intensity of incident electromagnetic radiation decreases to 1/e (approximately 36.8%) of its initial value. This parameter is inversely related to the linear Napierian absorption coefficient. It indicates how deeply light penetrates a substance before being significantly absorbed.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "linear Napierian absorption coefficient"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 757 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/optical-absorption-depth/"
}