selection rules
How picks happen
Selection rules are principles in physics and chemistry that determine which transitions between quantum states are allowed or forbidden.
They specify what changes in quantum numbers can occur during processes like the absorption or emission of light.
A transition that violates selection rules is called forbidden, though "forbidden" often means merely unlikely rather than impossible: The selection rules for electric dipole radiation require a change in angular momentum of plus or minus one.
- spontaneous emissionUnstimulated atomic radiation release
- energy levelsGradations of physical vitality
- conservation lawsQuantities unchanged through time
- hyperfine structureNuclear effects on spectra
- spectroscopyStudy of light-matter interaction
quantum mechanics · angular momentum · parity · forbidden · atomic orbitals · quantum states · wave functions · polarization · operator · coupling · photon · electric · ground state · decay · spin · magnetic · allowed · orbital
- quantum physicsquantum mechanics, quantum superposition, quantum state, quantum states, quantum entanglement
- quantum transitionsquantum jump, quantum leap, excited state, ground state, energy levels
- nuclear physicsnuclear energy, fission, nuclear fission, neutron, proton
- Orbitalsorbit, orbital, atomic orbital, electron shell, subshell
- spectral linesspectral lines, spectral line, emission spectrum, line width, bright lines
selection rulesrandom selection
Choosing without systematic bias
lottery system · randomization · blind draw · coin flip · luck of the draw
selection rulesopen admission
Accepting all applicants
unconditional acceptance · anything goes · free entry · permissiveness · free-for-all
rules, selection, election, elected, electoral, selective, elector, elective, selections