infrared

Region of the electromagnetic spectrum extending from $780 nm$ to about $20 000 nm$ .

According to the CIE, the range between $780 nm$ and $1 mm$ is subdivided into:

IR-A $780$ – $1400 nm$

IR-B $1.4$ – $3 µm$

IR-C $3 µm$ – $1 mm$

Note:

This is the wavelength region in which absorption by a molecular entity causes excitation of its vibrational, rotational, and bending modes.

Source:

PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 354

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Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.IT07399.

Original PDF version: http://www.iupac.org/goldbook/IT07399.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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