Example image of eyePlorer eyePlorer map for 'Hydrogen spectral series': Emission spectrum Hydrogen Rydberg formula Redshift Electron Energy level Physics Bohr model Photon Hydrogen line Hyperfine structure Fine structure Helium Nitrogen Rydberg constant Significant figures Theodore Lyman Ultraviolet Empirical Johann Jakob Balmer H-alpha Fraunhofer lines Austria Friedrich Paschen Germany Infrared Frederick Sumner Brackett August Herman Pfund Curtis J. Humphreys Muonium Bohr radius Ionization Theoretical and experimental justification for the Schrödinger equation SN 2005gj Johannes Rydberg Scientific phenomena named after people Balmer series Excited state Brackett Humphreys Paschen Azimuthal quantum number Lamb shift Sounding rocket X-ray astronomy Introduction to quantum mechanics X-ray astronomy