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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 7801400 nm
IR-B 1.43 µm
IR-C 3 µm1 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. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi: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 The PDF version is out of date and is provided for reference purposes only.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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