Rotation that the net magnetization experiences during the application of a
radiofrequency pulse in
nuclear magnetic resonance spectroscopy.
Note:
For a strong and rectangular RF-pulse of constant amplitude (\(B_{1}\)) and duration (\(t_{\rm{p}}\)), the resultant flip angle is approximately proportional to the frequency (\(f_{1}\)) of the \(B_{1}\) field: \(\alpha = \gamma B_{1} t_{\rm{p}}\), where \(\gamma\) is the gyromagnetic ratio.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 688 (https://doi.org/10.1515/pac-2019-0203)