Atoms Physics 37 Atomic, Molecular, Optical and Plasma Physics 20 Matter 20 Nuclear physics 17 Atoms and Molecules in Strong Fields, Laser Matter Interaction 14 Molecules 12 Quantum theory 11 Chemistry, Physical and theoretical 9 Optics 8 Chemistry 6 Electrodynamics 6 Optics and Electrodynamics 6 Spectrum analysis 6 Physical Chemistry 5 Astrophysics 4 Cosmology 4 Electronics 4 Ions 4 Laser Technology, Photonics 4 Lasers 4 Materials 4 Microscopy 4 Optical and Electronic Materials 4 Optical materials 4 Photonics 4 Radiation 4 Spectroscopy and Microscopy 4 Astronomy 3 Collisions (Nuclear physics) 3