Asymmetry parameter

{
  "id": "MLC-T-CHM-000869",
  "term": "Asymmetry parameter",
  "field": "Chemistry",
  "definition": "The factor β, used in X-ray photoelectron spectroscopy, that characterizes how the intensity of photoelectrons ejected from isolated atoms depends on the angle between the electron direction and the incident X-ray direction. It is defined within the dipole approximation, and at the magic angle the angular factor equals 1 whatever the value of β. For solids the gas-phase relation is modified by elastic scattering.",
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1820 (https://doi.org/10.1515/pac-2019-0404)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/asymmetry-parameter/"
}