of Part A. - I. Basic Properties of Atoms and Perturbations. - 1 Atomic Structure Theory. - 2 Density Matrix Formalism and Applications in Spectroscopy. - 3 Perturbation of Atoms. - 4 Quantum Electrodynamical Effects in Atomic Spectra. - 5 Inner Shells. - 6 Interatomic Potentials for Collisions of Excited Atoms. - II. Methods and Applications of Atomic Spectroscopy. - 7 New Developments of Classical Optical Spectroscopy. - 8 Excitation of Atoms by Impact Processes. - 9 Perturbed Fluorescence Spectroscopy. - 10 Recent Developments and Results of the Atomic-Beam Magnetic-Resonance Method. - 11 The Microwave-Optical Resonance Method. - 12 Lamb-Shift and Fine-Structure Measurements on One-Electron Systems. - 13 Anticrossing Spectroscopy. - 14 Time-Resolved Fluorescence Spectroscopy. - 15 Laser High-Resolution Spectroscopy. Language: English