Prefaces. The Basic Concepts of Quantum Mechanics. Energy and Momentum. Schrödinger’s Equation. Angular Momentum. Motion in a Centrally Symmetric Field. Perturbation Theory. The Quasi-classical Case. Spin. Identity of Particles. The Atom. The Diatomic Molecule. The Theory of Symmetry. Polyatomic Molecules. Addition of Angular Momenta. Motion in a Magnetic Field. Nuclear Structure. Elastic Collisions. Inelastic Collisions. Mathematical Appendices. Index.