Atomic and Molecular Structure and Properties Atomic structure   156 Molecular structure  156 Spectroscopy 49 Spectrum analysis 49 Physical Chemistry 46 Physical chemistry 46 more ... Chemistry, Physical and theoretical 31 Quantum physics 31 Theoretical Chemistry 31 Mathematical physics 30 Quantum Physics 30 Theoretical, Mathematical and Computational Physics 24 Condensed matter 20 Condensed Matter Physics 19 Elementary Particles, Quantum Field Theory 13 Elementary particles (Physics) 13 Quantum field theory 13 Materials—Analysis 12 Characterization and Analytical Technique 11 Atoms 10 Biophysics 10 Lasers 10 Molecules 10 Laser 9 Nuclear physics 9 Atomic, Molecular and Chemical Physics 8 Biology—Research 8 Biomedical Research 8 Chemistry, Organic 8 less ...