Evanescent wave

{
  "id": "MLC-T-CHM-004130",
  "term": "Evanescent wave",
  "field": "Chemistry",
  "definition": "A non-propagating electromagnetic field that exists near the interface of two media when light undergoes total internal reflection. This field decays exponentially with distance from the interface and does not carry energy away from the surface. It is commonly employed in attenuated total reflection (ATR) spectroscopy.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "electromagnetic radiation",
    "total internal reflection"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 745 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/evanescent-wave/"
}