frequency, \(\nu\), \(\omega\)

in photochemistry
https://doi.org/10.1351/goldbook.FT07383
The number of waveperiods per time interval. The linear frequency, \(\nu\), is the number of cycles per time interval. SI unit \(\text{Hz =  s}^{-1}\).
Note:
For the @A00352@ the symbol \(\omega\) (\(= 2\pi\nu\)) is used with \(\text{rad s}^{-1}\) as the SI unit.
See also:
frequency
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 345 [Terms] [Paper]