Linked from

The 17 pages that link to Fine-structure constant, each with the reason it gives.

• Quantum electrodynamicsBroader topic: It sets the scale of QED interaction corrections and organizes perturbative calculations.

• Quantum Hall effectRelated: Precision comparisons involving Hall resistance can determine this constant.

• Elementary chargeRelated: It relates the elementary charge to other constants and the electromagnetic coupling.

• Lamb shiftRelated: Its small value organizes the perturbative corrections responsible for the shift.

• Arnold SommerfeldRelated: Sommerfeld introduced this constant into the analysis of relativistic atomic spectra.

• Natural unitsRelated: It remains a physical coupling even when electromagnetic unit conventions set other constants to one.

• Electromagnetic interactionRelated: Its value controls the probability of photon–matter interactions.

• Atom interferometryRelated: Atom-recoil measurements can determine this constant through precise measurements of atomic motion.

• Rydberg constantRelated: The Rydberg constant and other spectroscopic quantities help determine its value.

• Classical electron radiusRelated: The classical radius is the electron Compton wavelength multiplied by this constant.

• Physical constantBroader topic: It quantifies electromagnetic coupling without depending on units.

• Bohr radiusRelated: Together with the electron Compton wavelength, it fixes the Bohr-radius scale.

• Electron massRelated: Precision comparisons involving this constant help determine electron mass.

• Polykarp KuschRelated: The electron’s magnetic anomaly is predicted in terms of this fundamental coupling.

• Mathematical constantBroader topic: It is a notable example of a constant that links mathematical form to physical measurement.

• Heaviside–Lorentz unitsRelated: In these units it is commonly written as e² divided by 4πℏc.

• UntriseptiumRelated: Its value helps set the relativistic threshold associated with nuclear charge near 137.