Contents 1. INTRODUCTION 1.1. Planck's radiation law 1.2. The photoelectric effect 1.3. Early atomic spectroscopy 1.4. The postulates of Bohr's theory of atomic structure 1.5. Development of quantum mechanics 1.6. Interaction of atoms and radiation 1926-39. 1.7. Optical physics since 1945 1.8. The present situation (1975) Problems References General references and further reading 2. REVIEW OF CLASSICAL ELECTRODYNAMICS 2.1. Maxwell's equations 17 2.2. The electromagnetic wave equations 20 2.3. Plane wave solutions 22 2.4. Linear and circular polarizations 24 2.5. The energy density and the Poynting vector 28 2.6. Vector and scalar potentials 30 2.7. Electric dipole radiation 33 2.8. Rate of radiation by an electric dipole 39 oscillator 2.9. Angular momentum of dipole radiation 40 2.10. Magnetic dipole radiation 43 2.11. Electric quadrupole radiation 44 2.12. Multipole fields 48 Problems 49 General references and further reading 51

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