Preface to first edition Preface to second edition 1. Introduction 2. The hydrogen atom: gross structure 3. Radiative transitions 4. The hydrogen atom: fine structure 5. Two-electron system 6. The central-field approximation 7. Angular problems in many-electron atoms 8. Interaction with static external fields 9. Hyperfine structure and isotope shift Appendix A. Some theorems of quantum mechanics Appendix B. Results of time-independent perturbation theory Appendix C. Notes on angular momentum Appendix D. Ground states of the elements Appendix E. Units Index