Illustrated Glossary of Organic Chemistry

NOESY (Nuclear Overhauser Effect SpectroscopY): A 2D-NMR technique utilizing the nuclear Overhauser effect. When a nucleus (usually a proton) relaxes from an excited nuclear spin state to its ground nuclear spin state the energy may be transferred to another nucleus in the molecule; this is called the nuclear Overhauser effect. The NOESY spectrum reveals which protons are close enough (usually no more than about 3 Angstroms apart) to transfer energy this way.

--NOESY spectrum to be added--