Angle of emission

{
  "id": "MLC-T-CHM-000596",
  "term": "Angle of emission",
  "field": "Chemistry",
  "definition": "The angle between the direction of an emitted particle or photon and the normal to the surface from which it is emitted. This parameter is controlled in surface-sensitive analytical techniques to vary the depth of information being probed. In X-ray photoelectron spectroscopy (XPS), smaller emission angles relative to the surface plane increase the surface sensitivity of the measurement.",
  "synonyms": [
    "emission angle"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "take-off angle"
  ],
  "references": [
    "PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1797 (https://doi.org/10.1515/pac-2019-0404)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/angle-of-emission/"
}