Title: adiabatic pulse
Long Title: IUPAC Gold Book - adiabatic pulse
DOI: 10.1351/goldbook.08313
Status: current

Definition
Radiofrequency pulse that inverts spins by using a frequency sweep during the pulse.

Notes
1) Adiabatic pulse allows very high spectral bandwidth and accurate flip angles to be achieved with high tolerance to spatial variations in RF field intensity and is thus of value in excitation of nuclei with frequency ranges.
2) The sweep must be slow enough to satisfy the adiabatic condition \({\rm{d}}\theta/{\rm{d}}t \ll \gamma \boldsymbol{B}_{\rm{eff}}\) where \(\boldsymbol{B}_{\rm{eff}}\) is the effective radiofrequency magnetic flux density and \(\theta\) is the angle between \(\boldsymbol{B}_{\rm{eff}}\) and abscissa.

Related Terms
- RF: https://goldbook.iupac.org/terms/view/08279
- spectral bandwidth: https://goldbook.iupac.org/terms/view/08286

Source
- PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 681 (https://doi.org/10.1515/pac-2019-0203)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/08313/html
- json: https://goldbook.iupac.org/terms/view/08313/json
- xml: https://goldbook.iupac.org/terms/view/08313/xml

Citation: Citation: 'adiabatic pulse' 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.08313
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Accessed: 2026-06-30T21:41:47+00:00