two-dimensional correlation spectrum 

Synonym: 2-D correlation spectrum
https://doi.org/10.1351/goldbook.08296
Three-dimensional surface in which two of the dimensions show frequency axes (ν1, ν2) and the third axis shows a correlation function of the spectral intensities observed at ν1 and ν2.
Note:
The shape of the surface shows whether the bands at the two wavenumbers are or are not correlated, and hence allows deductions to be made about the extent to which the different parts of the molecule are linked in their response to the applied external perturbation.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 677 [Terms] [Paper]
Citation: 'two-dimensional correlation spectrum' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08296 RIS BibTex EndNote
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