Mattauch-Herzog geometry

{
  "id": "MLC-T-CHM-007037",
  "term": "Mattauch-Herzog geometry",
  "field": "Chemistry",
  "definition": "A double-focusing arrangement for a mass spectrograph in which ions first pass through a radial electric field that deflects them through about 31.8 degrees, π/(4√2) radians, and then through a magnetic field that deflects them through 90 degrees. The geometry brings ions of all masses to a focus along a single plane, so a photographic plate or array detector records the whole spectrum at once. It is the classic geometry of spark-source mass spectrographs.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "mass spectrograph"
  ],
  "references": [
    "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/mattauch-herzog-geometry/"
}