Region of the electromagnetic spectrum extending from \(780\ \text{nm}\) to about \(20\,000\ \text{nm}\).
According to the CIE, the range between \(780\ \text{nm}\) and \(1\ \text{mm}\) is subdivided into:
IR-A \(780\)–\(1400\ \text{nm}\)
IR-B \(1.4\)–\(3\ \unicode[times]{x3BC}\text{m}\)
IR-C \(3\ \unicode[times]{x3BC}\text{m}\)–\(1\ \text{mm}\)
This is the @[email protected] region in which @[email protected] by a molecular entity causes excitation of its vibrational, rotational, and bending modes.
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 354 [Terms] [Paper]