Example image of eyePlorer eyePlorer map for 'Energy level': Bound state Classical mechanics Quantum mechanics Atom Atomic nucleus Electron Molecule Quantization (physics) Potential energy Quantum state Degenerate energy level Wavelength Standing wave Wave function Stationary state Particle in a box Quantum harmonic oscillator Atomic orbital Electron volt Planck constant Principal quantum number Rydberg constant Speed of light Fine structure Spin (physics) Spin–orbit interaction Dirac equation Eigenvalue, eigenvector and eigenspace Molecular geometry Molecular Hamiltonian Potential energy surface Molecular term symbol Molecular physics Quantum chemistry Crystal Electronic band structure Conduction band Fermi energy Vacuum level Valence band Perturbation theory (quantum mechanics) Adiabatic ionization Atomic spectral line Bohr–Sommerfeld theory Dark state Electron excitation Hyperfine structure Kramers theorem Kubo Gap Lamb shift