Atomic and Nuclear physics 187 Physics 91 Atoms 64 Chemistry 53 Nuclear physics 46 Radiochemistry 45 Molecular spectroscopy; Nuclear structure; Atomic and Nuclear physics 41 Atomic spectroscopy 36 Atomic structure 36 Quantum theory 33 Atomic physics 29 Molecular spectroscopy 26 Journal of physics B 25 Chemical technology 22 Atomic theory 20 Molecules 19 Atom 18 Isotopes 17 Atomic Structure 16 Quantum chemistry 16 Spectroscopy 15 Atomic Physics 14 Crop improvement 13 Nuclear energy 13 Soil science 13 Spectrum analysis 13 ATOMIC ENERGY 12 Agricultural chemistry 12 Nanotechnology 12 Nuclear Physics 12