Title: two-dimensional correlation spectrum
Long Title: IUPAC Gold Book - two-dimensional correlation spectrum
DOI: 10.1351/goldbook.08296
Status: current

Definition
Three-dimensional surface in which two of the dimensions show frequency axes (\(\nu_{1}\), \(\nu_{2}\)) and the third axis shows a correlation function of the spectral intensities observed at \(\nu_{1}\) and \(\nu_{2}\).

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.

Related Term
- dynamic spectrum: https://goldbook.iupac.org/terms/view/08590

Source
- PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 677 (https://doi.org/10.1515/pac-2019-0203)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/08296/html
- json: https://goldbook.iupac.org/terms/view/08296/json
- xml: https://goldbook.iupac.org/terms/view/08296/xml

Citation: 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. 10.1351/goldbook.08296
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Accessed: 2026-07-27T02:32:09+00:00