Zero path difference

{
  "id": "MLC-T-CHM-012799",
  "term": "Zero path difference",
  "field": "Chemistry",
  "definition": "The point in an interferometer where the optical path lengths of the two arms are exactly equal. At this position, all wavelengths of light interfere constructively, producing a central burst of maximum intensity in the interferogram. This point serves as a reference for measuring the optical path difference in Fourier transform infrared spectroscopy.",
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 679 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/zero-path-difference/"
}