08366 IUPAC Gold Book - imaginary NMR spectrum 10.1351/goldbook.08366 08366 current synonym: imaginary spectrum 1 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. Usually the imaginary frequency data is not displayed and is used for phase correction of the real spectrum. In simple 1D spectra this equates to the NMR signals being in dispersion mode. nuclear magnetic resonance spectroscopy https://goldbook.iupac.org//terms/view/08218 spectrum https://goldbook.iupac.org//terms/view/08384 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) https://goldbook.iupac.org/terms/view/08366/html https://goldbook.iupac.org/terms/view/08366/json https://goldbook.iupac.org/terms/view/08366/plain Citation: 'imaginary NMR spectrum' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.08366 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-11T22:21:07+00:00