Observation frequency

{
  "id": "MLC-T-CHM-008171",
  "term": "Observation frequency",
  "field": "Chemistry",
  "definition": "The specific frequency at which a spectroscopic measurement is performed, particularly in techniques like nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR). This frequency is determined by the strength of the external magnetic field and the gyromagnetic ratio of the nucleus or electron being observed. For instance, a proton NMR spectrometer is often described by its proton observation frequency, such as 500 MHz.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "spectrum"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 699 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/observation-frequency/"
}