Illustrated Glossary of Organic Chemistry

Fourier Transform NMR (FT-NMR): A method to collect an NMR spectrum in which a pulse of radio frequency energy is used to excite all nuclei of a particular isotope (1H, 13C, etc.) in the molecule simultaneously. As the excited nuclei relax, they re-emit radio wave photons which produce an interference pattern called the free induction decay (FID). A mathematical process called a Fourier transform is used to convert the FID into the NMR spectrum.

Absorb photon


Emit photon


Fourier transform

Ground state

Excited state

Free induction decay
NMR spectrum