Quantum mechanics Physics 57 Quantum theory 7 Chemistry 5 Mechanics 5 Angular momentum 4 Quantum chemistry 4 Energy levels 3 Group theory 3 Gases 2 Mathematics 2 Nuclear magnetic resonance spectroscopy 2 Nuclear physics 2 Physical chemistry 2 Thermodynamics 2 Applied physics 1 Applied physics- Spectroscopy 1 Atomic physics 1 Atoms 1 Biochemistry 1 Biology 1 Chemical bonds 1 Classical concepts 1 Classical mechanics 1 Computer simulation methods 1 Conservation laws 1 Crystal structure 1 Diatomic molecule 1 Diatomic molecules 1 Differential equation 1