Title: sustained off-resonance irradiation
Long Title: IUPAC Gold Book - sustained off-resonance irradiation
DOI: 10.1351/goldbook.12590
Status: current

Definition
Procedure associated with Fourier transform-ion cyclotron resonance-mass spectrometers to facilitate ion/neutral reactions such as low-energy collision-induced dissociation in which a radio-frequency electric field, slightly off-resonance with respect to the cyclotron frequency of the reactant ion, cyclically accelerates and decelerates the reactant ion that is confined in the Penning ion trap. As a consequence, the orbit does not exceed the dimensions of the ion trap but maintains a high average translational energy for an extended time that activates an ion/neutral process.

Related Terms
- Penning ion trap: https://goldbook.iupac.org//terms/view/12521
- low-energy collision-induced dissociation: https://goldbook.iupac.org//terms/view/12472

Source
- PAC, 2013, 85, 1515. 'Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)' on page 1594 (https://doi.org/10.1351/PAC-REC-06-04-06)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/12590/html
- json: https://goldbook.iupac.org/terms/view/12590/json
- xml: https://goldbook.iupac.org/terms/view/12590/xml

Citation: Citation: 'sustained off-resonance irradiation' 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.12590
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Accessed: 2026-05-08T04:08:34+00:00