Infrared radiation of which
vacuum wavenumbers range from approximately
\(\pu{12800 cm-1}\) to
\(\pu{4800 cm-1}\) and
wavelengths range from approximately
\(\pu{780 nm}\) to
\(\pu{2500 nm}\).
Note:
The region is often divided into the silicon region between \(\pu{12800 cm-1}\) and \(\pu{9000 cm-1}\) (\(\pu{800 nm}\) and \(\pu{1100 nm}\)) and the lead sulfide region between \(\pu{9000 cm-1}\) and \(\pu{4000 cm-1}\) (\(\pu{1100 nm}\) and \(\pu{2500 nm}\)), where the names reflect the common detector for the region.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 755 (https://doi.org/10.1515/pac-2019-0203)