Ernst angle

{
  "id": "MLC-T-CHM-004085",
  "term": "Ernst angle",
  "field": "Chemistry",
  "definition": "The specific flip angle in a pulsed nuclear magnetic resonance experiment that provides the maximum signal intensity for a given spin system and repetition time. This optimal angle depends on the pulse repetition time and the spin-lattice relaxation time (T1) of the nucleus being observed. The Ernst angle is calculated using the equation cos(α) = exp(-TR/T1), where α is the angle and TR is the repetition time.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "flip angle",
    "spin-lattice relaxation time",
    "nuclear magnetic resonance spectroscopy",
    "signal-to-noise ratio"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 687 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/ernst-angle/"
}