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reciprocal m, written m⁻¹.However, it is more common, especially in spectroscopy, to give wavenumbers in cgs units i.e., reciprocal centimeters or cm⁻¹, with
: .

Occasionally in older references, the unit kayser (after Heinrich Kayser) is used; it is abbreviated as K or Ky, where 1K = 1cm^-1.

Angular wavenumber may be expressed in the unit radian

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