Collisional focusing

{
  "id": "MLC-T-CHM-002232",
  "term": "Collisional focusing",
  "field": "Chemistry",
  "definition": "A technique in mass spectrometry that uses collisions between ions and a buffer gas to confine and guide ions through a region, improving ion transmission efficiency. The collisions dampen the kinetic energy of the ions, reducing their radial velocity components and concentrating them along the central axis. This method is often employed in ion funnels and multipole ion guides.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "buffer gas",
    "ion trap",
    "transmission quadrupole mass spectrometer"
  ],
  "references": [
    "PAC, 2013, 85, 1515. 'Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)' on page 1531 (https://doi.org/10.1351/PAC-REC-06-04-06)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/collisional-focusing/"
}