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