diffusion ordered spectroscopy 

Acronym: DOSY
https://doi.org/10.1351/goldbook.08329
Pseudo-two-dimensional nuclear magnetic resonance spectroscopy experiment that resolves NMR signals of a one-dimensional nuclear magnetic resonance spectrum in a second dimension through the diffusion times of their corresponding molecules.
Notes:
  1. DOSY is used to differentiate signals from different molecules based on their effective sizes.
  2. DOSY relies on spatially encoding the analyte by use of pulsed-field gradients.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 685 (https://doi.org/10.1515/pac-2019-0203)