Rydberg constant is a physical constant named after Swedish physicist Johannes Rydberg. The constant relates atomic spectra, in the science of spectroscopy and is denoted by the symbol R_{∞}. It is the constant for heavy atoms or R_{H} for hydrogen. The constant is used in limiting the value of the highest wavenumber of any photon that can be emitted from the hydrogen atom.

Rydberg constant is a physical constant named after Swedish physicist Johannes Rydberg. The constant relates atomic spectra, in the science of spectroscopy and is denoted by the symbol R_{∞}. It is the constant for heavy atoms or R_{H} for hydrogen. The constant is used in limiting the value of the highest wavenumber of any photon that can be emitted from the hydrogen atom.

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The Rydberg unit of energy, symbol Ry, is closely related to the Rydberg constant.

The Rydberg unit of energy, symbol Ry, is closely related to the Rydberg constant.