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Wavenumber (cm⁻¹)

The reciprocal of wavelength (in centimeters), directly proportional to the energy of the absorbed photon in spectroscopy.

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The statement of the theorem

Define the wavenumber

k

(in

\text{cm}^{-1}

) as the reciprocal of the wavelength

\lambda

(in

\text{cm}

k = \frac{1}{\lambda}

. The relationship between wavenumber

k

, energy

E

, and Planck's constant

h

and the speed of light

c

is given by:

E = h c k

. This proportionality establishes that

k

is directly proportional to the energy of the absorbed photon.

Source: Wikipedia