Extraordinary wave

{
  "id": "MLC-T-CHM-004302",
  "term": "Extraordinary wave",
  "field": "Chemistry",
  "definition": "A wave of electromagnetic radiation that propagates through an anisotropic medium, such as a birefringent crystal, with a velocity that depends on its direction of propagation and polarization. Its refractive index varies with the direction of propagation. This behavior contrasts with an ordinary wave, which has a constant refractive index regardless of direction.",
  "synonyms": [
    "extraordinary ray"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "electromagnetic radiation",
    "ordinary wave"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 746 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/extraordinary-wave/"
}