Spin echo

{
  "id": "MLC-T-CHM-011202",
  "term": "Spin echo",
  "field": "Chemistry",
  "definition": "A nuclear magnetic resonance (NMR) phenomenon where a transient signal is generated by refocusing the dephasing of nuclear spins. This refocusing is achieved by applying a 180° radiofrequency pulse after an initial 90° pulse. The spin echo technique is widely used in NMR spectroscopy and magnetic resonance imaging (MRI) to measure relaxation times.",
  "synonyms": [
    "Hahn echo"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "180° pulse",
    "90° pulse",
    "echo time",
    "flip angle",
    "pulse sequence",
    "radiofrequency"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 705 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/spin-echo/"
}