Beam spill-off

{
  "id": "MLC-T-CHM-001167",
  "term": "Beam spill-off",
  "field": "Chemistry",
  "definition": "The portion of the incident X-ray beam that misses the specimen in X-ray reflectometry, because at small grazing angles the beam footprint is longer than the sample. The missed part does not interact with the sample and has to be corrected for when the reflectivity is calculated.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "X-ray reflectometry"
  ],
  "references": [
    "PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1847 (https://doi.org/10.1515/pac-2019-0404)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/beam-spill-off/"
}