Title: shakeoff
Long Title: IUPAC Gold Book - shakeoff
DOI: 10.1351/goldbook.09353
Status: current

Definition
Multi-electron process in which two or more electrons are emitted, partitioning between them the excess kinetic energy.

Note
Shakeoff leads to a continuum background intensity at kinetic energies below that of the parent peak in the electron spectrum. This is in contrast to shakeup, which leads to peak structure, also at kinetic energies below that of a parent peak.

Related Term
- shakeup: https://goldbook.iupac.org//terms/view/09354

Source
- PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1830 (https://doi.org/10.1515/pac-2019-0404)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/09353/html
- json: https://goldbook.iupac.org/terms/view/09353/json
- xml: https://goldbook.iupac.org/terms/view/09353/xml

Citation: Citation: 'shakeoff' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09353
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Accessed: 2026-04-20T14:53:27+00:00