Bragg’s rule

{
  "id": "MLC-T-CHM-001466",
  "term": "Bragg’s rule",
  "field": "Chemistry",
  "definition": "An empirical additivity rule stating that the energy loss of fast ions in a compound, expressed as a stopping cross section, is well approximated by the sum of the contributions of its constituent atoms, weighted by their abundance. The rule fills in when measured stopping data for a compound are missing, notably in Rutherford backscattering spectrometry. It neglects chemical bonding, so measured values for some compounds deviate from the sum.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "stopping cross section"
  ],
  "references": [
    "PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1799 (https://doi.org/10.1515/pac-2019-0404)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/braggs-rule/"
}