Molecular Quantum Mechanics established itself as a classic as soon as the original edition appeared. Maintaining the important and essential spirit of the earlier editions, this third edition remains in the forefront of its field. The book has been entirely rewritten to present the subject more clearly than ever before, and the use of two-color art helps to make the text even more accessible. The text remains unique in the range of topics it covers, from the foundations of quantum mechancis to applications such as spectroscopy and the electric and magnetic properties of matter. Two entirely new chapters have been added to this third edition. One is an introduction to computational techniques in quantum chemistry and the other is an introduction on scattering theory. Anyone teaching courses using quantum mechanics, particularly quantum chemistry, will not only find this volume authoritative but highly approachable as well.