Pake doublet

https://doi.org/10.1351/goldbook.08390
Characteristic line shape seen in solid-state nuclear magnetic resonance spectroscopy arising from dipolar coupling between two nuclei.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 699 (https://doi.org/10.1515/pac-2019-0203)