https://doi.org/10.1351/goldbook.W06664
The reciprocal of the
wavelength
, λ, or the number of waves per unit length along the direction of
propagation
. The SI unit is m1, but a commonly used unit is cm1. Symbols ν˜ in a vacuum, σ in a medium.
Sources:
Green Book, 2nd ed., p. 30 [Terms] [Book]
PAC, 1985, 57, 105. (Names, symbols, definitions and units of quantities in optical spectroscopy (Recommendations 1984)) on page 109 [Terms] [Paper]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2283 [Terms] [Paper]