ultraviolet (UV)

Region of the electromagnetic spectrum extending from about 100 nm to 400 nm. This region is divided into four sub-bands as follows:
Vacuum Ultraviolet (VUV 100-200 nm
UV-C 200-280 nm
UV-B 280-315 nm
UV-A315-400 nm.
The notation and the limits of the various regions are as recommended by the International Commission on Illumination (CIE), with the exception that in these recommendations the UV-C range is 100-280 nm, including thus the vacuum UV range.
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 437 (https://doi.org/10.1351/pac200779030293)