Diagram level

{
  "id": "MLC-T-CHM-003123",
  "term": "Diagram level",
  "field": "Chemistry",
  "definition": "An atomic energy level in X-ray and electron spectroscopy that corresponds to a single vacancy created by taking one electron out of a neutral ground-state atom, whether from a core or a valence orbital. These levels give the normal, or diagram, X-ray lines, whereas multiply ionised states give satellite lines. A level with nonzero orbital angular momentum occurs as a spin-orbit pair such as 2p1/2 and 2p3/2.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "angular momentum",
    "ground state",
    "valence"
  ],
  "references": [
    "PAC, 1991, 63, 735. 'Nomenclature, symbols, units and their usage in spectrochemical analysis - VIII. Nomenclature system for X-ray spectroscopy (Recommendations 1991)' on page 738 (https://doi.org/10.1351/pac199163050735)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/diagram-level/"
}