Precursor ion

{
  "id": "MLC-T-CHM-009363",
  "term": "Precursor ion",
  "field": "Chemistry",
  "definition": "An ion selected in a mass spectrometry experiment that undergoes fragmentation to produce other ions. This initial ion is typically isolated in a mass analyzer before being subjected to collision-induced dissociation or other fragmentation methods. The mass-to-charge ratio of the precursor ion is measured before fragmentation.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "parent ion"
  ],
  "references": [
    "Orange Book, 2nd ed., p. 205 (https://media.iupac.org/publications/analytical_compendium/)",
    "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 1549 (https://doi.org/10.1351/pac199163101541)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/precursor-ion/"
}