Example image of eyePlorer eyePlorer map for 'Atomic spectral line': Energy level Physics Spectral line Bound state Continuous spectrum Ionization Photon Planck constant Planck's law Emission spectrum Kirchhoff's law of thermal radiation Laser Maxwell–Boltzmann distribution Thermodynamic equilibrium Albert Einstein Spectral linewidth Stimulated emission Radiance Detailed balance Boltzmann constant Partition function Temperature Speed of light Helium line ratio Isomeric shift Atomic emission spectroscopy Atomic line filter Colored fire Interstellar reddening Optical decay Superconductivity Ultra fast laser spectroscopy Deuterium arc lamp Galaxy groups and clusters Sulfur lamp Atomic orbital Electron shell Timeline of thermodynamics Sodium Plasma diagnostics Angular momentum coupling Ambiguity Atom Redshift