Application of a frequency selective
radiofrequency pulse(s) to a single resonance or a discrete band of frequencies.
Note:
Selective excitation is usually achieved through the application of long, low power (soft) pulses.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 704 (https://doi.org/10.1515/pac-2019-0203)