Isomeric state

{
  "id": "MLC-T-CHM-006202",
  "term": "Isomeric state",
  "field": "Chemistry",
  "definition": "An excited nuclear state with a measurable lifetime, significantly longer than that of ordinary excited states, often exceeding 10^-9 seconds. These states arise from large differences in angular momentum between the isomeric state and lower-energy states, hindering gamma-ray transitions. The decay of an isomeric state to a lower energy state is known as an isomeric transition.",
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 1982, 54, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1545 (https://doi.org/10.1351/pac198254081533)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/isomeric-state/"
}