imaginary NMR spectrum

synonym: imaginary spectrum
https://doi.org/10.1351/goldbook.08366
In nuclear magnetic resonance spectroscopy, one of two equally sized blocks of frequency data \(\pu{90\!^{\circ}}\) out of phase to each other produced by Fourier transformation of the time domain signal.
Notes:
  1. Usually the imaginary frequency data is not displayed and is used for phase correction of the real spectrum.
  2. In simple 1D spectra this equates to the NMR signals being in dispersion mode.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 693 (https://doi.org/10.1515/pac-2019-0203)