Linked from

The 14 pages that link to Atomic energy level, each with the reason it gives.

• LaserRelated: Transitions between energy levels supply the photons that a laser amplifies.

• Electron shellNarrower topic: Shells group states, but energy levels need not align exactly with shell boundaries.

• X-ray spectroscopyRelated: Differences between these levels set characteristic X-ray transition energies.

• Atomic spectrumBroader topic: A spectral line’s wavelength records the energy difference between two levels.

• Atomic spectroscopyBroader topic: Radiation changes an atom’s energy by moving it between these discrete states.

• Atomic emission spectrumBroader topic: The spacing of these states determines which emission wavelengths are possible.

• Optical pumpingNarrower topic: Pumping acts by moving population among these discrete states.

• Einstein coefficientsNarrower topic: Each coefficient is defined for transitions between a specified pair of atomic levels.

• James FranckBroader topic: The experiment’s discrete energy losses corresponded to transitions between atomic energy levels.

• Franck–Hertz experimentNarrower topic: Mercury absorbs collision energy only when it can reach a higher allowed state.

• Johannes RydbergRelated: Differences between these levels determine the wavelengths described by the later quantum interpretation of Rydberg’s formula.

• Planck relationRelated: Radiation emitted or absorbed in transitions has frequency set by the energy difference.

• Atomic emission spectroscopyBroader topic: Differences between these energies determine the wavelengths of emitted lines.

• Gustav Ludwig HertzNarrower topic: The experiments showed that atomic excitation requires energy matching differences between allowed states.