https://doi.org/10.1351/goldbook.08302
Reciprocal of the vacuum wavelength of electromagnetic radiation. .
Notes:
- Wavenumber is related to the energy change,
, induced when the radiation is absorbed by , where is the Planck constant and the speed of the radiation. - Wavenumber should only be used when no confusion with frequency is possible.
- The symbol
is often used instead of ; this usage should be discouraged. - SI unit:
. Common unit: .