IUPAC - infrared radiation (08617)

infrared radiation

synonym: infrared

initialism: IR

https://doi.org/10.1351/goldbook.08617

Electromagnetic radiation of wavelength between approximately

780 nm

and

1000 μ m

or of wavenumber between approximately

13 000 {cm}^{- 1}

and

10 {cm}^{- 1}

Notes:

The infrared range is sub-divided into three regions: near-infrared: $780 nm$ to $2.5 μ m$ ( $12 800 {cm}^{- 1}$ to $400 {cm}^{- 1}$ ); mid-infrared: $2.5 μ m$ to $25 μ m$ ( $4000 {cm}^{- 1}$ to $400 {cm}^{- 1}$ ) and far infrared: $25 μ m$ to $1000 μ m$ ( $400 {cm}^{- 1}$ to $10 {cm}^{- 1}$ ).
The wavelength regions given are commonly used in chemistry and relate to working ranges of infrared spectrometers. Note that in other disciplines (e.g., astronomy) the terms are defined for different ranges.
If there is no ambiguity the term 'infrared' is used for the mid-infrared region.

See: infrared spectroscopy, Raman spectroscopy

Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 750 [Terms] [Paper]

Citation: 'infrared radiation' 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.08617 RIS BibTex EndNote

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infrared radiation