90° pulse

{
  "id": "MLC-T-CHM-000024",
  "term": "90° pulse",
  "field": "Chemistry",
  "definition": "A radiofrequency pulse in nuclear magnetic resonance (NMR) spectroscopy that rotates the net magnetization vector of nuclear spins by 90 degrees from the equilibrium z-axis into the xy-plane. This action creates a transverse magnetization that can be detected as an NMR signal. It is the initial pulse in most basic NMR experiments.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "nuclear magnetic resonance spectroscopy",
    "radiofrequency"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 681 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/90deg-pulse/"
}