This edition has been completely revised to include some 20% of new material. Important recent developments such as the theory of Regge poles are now included. Many problems with solutions have been added to those already contained in the book.

The basic concepts of quantum mechanics; Energy and momentum; Chrodinger's equation; Angular momentum; Perturbation theory; Spin; The identity of particles; The atom; The theory of symmetry; Polyatomic molecules; Motion in a magnetic field; Nuclear structure; Elastic collisions; Mathematical appendices.