multi-dimensional nuclear magnetic resonance spectrum multi-dimensional free induction decay spectrum multi dimensional FID spectrum FID spectra multi-dimensional free induction decay spectrum FID spectrum free induction decay spectra free induction decay spectrum A multi-dimensional free induction decay spectrum is a nuclear magnetic resonance spectrum with multiple dimensions that quantifies the combined decay of aligned nuclear spins after excitation with a short radio-frequency pulse (data before the Fourier transform to the frequency domain. [Allotrope]