Title: scattered-ion energy
Long Title: IUPAC Gold Book - scattered-ion energy
DOI: 10.1351/goldbook.09382
Status: current

Definition
Kinetic energy of a primary ion after a collision.

Note
Following binary elastic scattering, the kinetic energy of the primary or probe ions, \(E_{\rm{s}}\), is given by \(E_{\rm{s}} = E_{0}[M_{0}/(M_{0} + M_{1})]^{2} \{\cos\theta + [(M_{0}/M_{1})^{2} - \sin^{2}\theta]^{½}\}^{2}\) where \(E_{0}\) is the kinetic energy of the incident probe ion prior to scattering; \(M_{0}\) is the mass of the probe ion; \(M_{1}\) is the mass of the target atom; \(\theta\) is the angle between the initial and final velocity vectors for the probe ion, as determined from a common origin in the laboratory coordinate system, expressed as a value between \(\pu{0\!^{\circ}}\) and \(\pu{180\!^{\circ}}\).

Related Terms
- primary ion: https://goldbook.iupac.org//terms/view/09414
- probe ions: https://goldbook.iupac.org//terms/view/09378

Source
- PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1835 (https://doi.org/10.1515/pac-2019-0404)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/09382/html
- json: https://goldbook.iupac.org/terms/view/09382/json
- xml: https://goldbook.iupac.org/terms/view/09382/xml

Citation: Citation: 'scattered-ion energy' 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.09382
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Accessed: 2026-04-18T16:00:27+00:00