Appearance energy

{
  "id": "MLC-T-CHM-000747",
  "term": "Appearance energy",
  "field": "Chemistry",
  "definition": "The minimum energy required to form a particular fragment ion from a neutral molecule, along with any neutral fragments, in a mass spectrometer. This energy is determined by measuring the ion current as a function of the electron energy or photon energy. It provides insight into bond dissociation energies and thermochemical properties of molecules.",
  "synonyms": [
    "appearance potential"
  ],
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "ionization",
    "mass spectrometry",
    "photoionization"
  ],
  "references": [
    "PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2175 (https://doi.org/10.1351/pac199062112167)",
    "PAC, 1991, 63, 1541. 'Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)' on page 1546 (https://doi.org/10.1351/pac199163101541)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/appearance-energy/"
}