Nuclear electric quadrupole moment

{
  "id": "MLC-T-CHM-008097",
  "term": "Nuclear electric quadrupole moment",
  "field": "Chemistry",
  "definition": "A measure of the deviation of a nucleus from spherical symmetry, arising from the non-uniform distribution of electric charge within the nucleus. This moment interacts with an external electric field gradient, leading to energy level splittings observable in nuclear magnetic resonance spectroscopy. It is a tensor quantity, with its magnitude often expressed in units of barn (1 barn = 10^-28 m^2).",
  "synonyms": [
    "quadrupole moment of a nucleus"
  ],
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 697 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/nuclear-electric-quadrupole-moment/"
}