homonuclear decoupling 

Synonym: decoupling
https://doi.org/10.1351/goldbook.08365
Spin decoupling in nuclear magnetic resonance spectroscopy between two signals of the same nuclear isotope.
Note:
Homonuclear decoupling is normally performed through selective excitation of specific NMR signals within a spectrum or through pure shift experiments such as PSYCHE.
See also: heteronuclear decoupling
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 693 (https://doi.org/10.1515/pac-2019-0203)