Wavenumber: Difference between revisions
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In spectroscopy, the '''wavenumber''' indicates the number of [[Electromagnetic spectrum|EM waves]] that would fit in a unit of length. The normal units for wavenumbers are inverse centimeters cm<sup>-1</sup>. A different name for this unit is kayser (after [[Heinrich Kayser]]). Light with a wavelength of 500 nm (green) has a wavenumber of 20,000 cm<sup>-1</sup> or 20 kK. Photon energy and frequency are proportional to wavenumber: 10 kK corresponds to 1.24 eV. | |||
Historically, wavenumbers were introduced by [[Janne Rydberg]] in the 1880's in his analyses of atomic spectra. | |||
Wavenumbers (<math>v'</math>), wavelength (<math>\lambda</math>), and frequency (<math>v</math>) are related: | Wavenumbers (<math>v'</math>), wavelength (<math>\lambda</math>), and frequency (<math>v</math>) are related: | ||
Revision as of 18:29, 27 October 2007
In spectroscopy, the wavenumber indicates the number of EM waves that would fit in a unit of length. The normal units for wavenumbers are inverse centimeters cm-1. A different name for this unit is kayser (after Heinrich Kayser). Light with a wavelength of 500 nm (green) has a wavenumber of 20,000 cm-1 or 20 kK. Photon energy and frequency are proportional to wavenumber: 10 kK corresponds to 1.24 eV.
Historically, wavenumbers were introduced by Janne Rydberg in the 1880's in his analyses of atomic spectra.
Wavenumbers (), wavelength (), and frequency () are related:
![{\displaystyle v'[cm^{-1}]={\frac {1}{\lambda [cm]}}={\frac {v[sec^{-1}]}{(c{\frac {m}{sec}})(100{\frac {cm}{m}})}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/66ae33af168853adf99024dc155215428258ef11)