spin has several consequences

• doubles number of electronic states in atoms
• weak interaction couples to spin
• electromagnetism-spin coupling
• spin magnetic dipole moment

source psfile jl@crush.caltech.edu index oscillating_magnetic_field anomalous_Zeeman_effect wigner_eckhart_theorem spin-orbit_interaction spin_magnetic_dipole spin-orbit_coupling pauli_spin_matrices hyperfine_splitting fine_structure dirac_equation spin_matrices spin-orbitals particle_spin stark_effect rotation