A surname from Swedish. / A lunar impact crater that is located on the far side of the Moon.

(physics, chemistry) Any atom which has a single valence electron in a shell well outside any other electrons in the aton; approximates the hydrogen atom.

(physics) A universal scaling factor for all spectroscopic transitions.

plural of Rydberg atom

(physics) A molecule, especially one consisting of two atoms of the same element, that has a permanent dipole because one of the atoms is in a very high excited state.

plural of Rydberg molecule

plural of Rydberg constant

A formula used in atomic physics to describe the wavelengths of spectral lines of many chemical elements.

plural of Rydberg state

(physics) Any of those electronically excited states of an atom or molecule with energies that follow the Rydberg formula as they converge on an ionic state with an ionization energy.