An Etymological Dictionary of Astronomy and Astrophysics
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A unit of energy used in atomic physics, equal to about 13.6 electron-volts, the ionization potential of hydrogen.

In honor of the Swedish physicist Johannes Robert Rydberg (1854-1919), who did important contributions on spectroscopy, and in particular found a relatively simple expression relating the various lines in the spectra of chemical elements (1890).

A fundamental constant of atomic physics appearing in the → Rydberg formula. The Rydberg constant for hydrogen is 109,739 cm^-1.

→ rydberg; → constant.

A term inserted into a formula for the energy of a single electron in the outermost shell of an atom to take into account the failure of the inner electron shells to screen the nuclear charge completely.

→ rydberg; → correction.

A formula, used in atomic physics, which describes the wavelengths or frequencies of light in various series of related spectral lines, such as those emitted by hydrogen atoms.

→ rydberg; → formula.