The Rydberg constant is a physical constant relating to atomic spectra and is often used in spectroscopy.  The Rydberg constant represents the limiting value of the highest wavenumber (the inverse wavelength) of any photon that can be emitted from the hydrogen atom.

`R_infty = (m_e * e^4) /(8 epsilon_0^2 * h^3 *c)`, where:

• `m_e` is the rest mass of an electron
• h is Planck's Constant
• `epsilon_0` is the permittivity of a vacuum
• c is the speed of light in a vacuum

Notes

This constant is specified with a standard uncertainty (standard deviation) of: 0.000055 /m