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The 43 pages that link to Selection rule, each with the reason it gives.

• SpectroscopyRelated: Selection rules explain why some possible energy-level transitions leave no spectral line.

• Zeeman effectRelated: They determine which shifted levels connect, and thus which components appear.

• Spectral lineRelated: Allowed transitions determine which potential spectral lines actually appear.

• Quantum numberRelated: Changes in quantum numbers determine whether transitions satisfy allowed selection rules.

• Molecular spectroscopyRelated: Selection rules explain why some molecular transitions appear while others are absent.

• Molecular vibrationRelated: Different dipole and polarizability selection rules govern infrared and Raman activity.

• Energy levelRelated: Selection rules determine which pairs of levels produce visible transitions.

• Fine structureRelated: Selection rules determine which fine-structure transitions produce observable spectral lines.

• Atomic spectrumRelated: Selection rules explain why some possible energy differences produce no observed line.

• Point groupRelated: Molecular point-group symmetry determines many spectroscopic selection rules.

• Vibrational spectroscopyRelated: Selection rules determine which vibrations appear in infrared and Raman spectra.

• Angular momentum operatorRelated: Angular-momentum algebra determines allowed changes in magnetic and total angular-momentum quantum numbers.

• Molecular symmetryRelated: Symmetry determines whether molecular transitions can interact with light.

• Atomic spectroscopyRelated: Selection rules explain why some possible energy gaps produce no observed spectral line.

• Orbital angular momentumRelated: Angular momentum conservation restricts which orbital transitions electric-dipole radiation permits.

• Emission spectrumRelated: Allowed transitions determine which emission lines can appear and their relative strengths.

• Charge conjugationRelated: Conservation of charge-conjugation parity forbids some decays and transitions.

• Hyperfine structureRelated: Hyperfine transition rules determine which split levels appear as spectral lines or clock transitions.

• Microwave spectroscopyRelated: Molecular dipole moments determine whether rotational transitions can absorb microwave radiation.

• Atomic emission spectrumRelated: Selection rules explain why some energy-level pairs produce no spectral line.

• Excited stateRelated: Selection rules determine which excited states can be reached or decay radiatively.

• Atomic energy levelRelated: Level differences alone do not determine whether an atom can make a transition.

• Stark effectRelated: Dipole selection rules determine which field-mixed transitions appear in spectra.

• Spontaneous emissionRelated: Selection rules determine which spontaneous transitions can occur and their relative strengths.

• Electronic transitionRelated: Selection rules identify transitions that can produce observable spectral lines.

• Hydrogen spectrumRelated: Electric-dipole selection rules explain why some possible level changes produce no strong spectral line.

• Clebsch–Gordan coefficientsRelated: Coefficient zeros enforce restrictions on allowed angular-momentum transitions.

• Magnetic quantum numberRelated: Spectroscopic transitions often restrict changes in the magnetic quantum number.

• AnharmonicityRelated: Anharmonic vibrational wavefunctions relax the harmonic oscillator’s strict transition restriction.

• Atomic physicsRelated: Selection rules explain why some predicted atomic spectral lines are absent.

• Nuclear isomerRelated: Angular-momentum and parity constraints can hinder an isomer’s decay.

• Electronic spectroscopyRelated: Selection rules help explain why some electronic transitions produce weak or absent bands.

• Strange particlesRelated: The strangeness selection rule blocks many otherwise available strong decays.

• Azimuthal quantum numberRelated: Electric-dipole transitions typically require a change in ℓ of exactly one.

• Wigner–Eckart theoremRelated: The theorem’s angular factors make many transitions vanish by symmetry.

• Rotational–vibrational spectroscopyRelated: Selection rules determine which combined rotational–vibrational transitions appear in a spectrum.

• Symmetry in quantum mechanicsRelated: Symmetry labels make many transition amplitudes vanish.

• Atomic and molecular processes in external fieldsRelated: Field interactions can enable or forbid transitions between atomic and molecular states.

• Forbidden mechanismRelated: Orbital-symmetry restrictions are selection rules applied to chemical reactions.

• Multipole matrix elementsRelated: Multipole rank and parity impose selection rules on transitions between states.

• QuantumRelated: Selection rules restrict which quantized energy exchanges are physically allowed.