Part 1 Spectroscopy and electronic structure of inorganic solids: classical optical constants; spectroscopy and quantum mechanics; atoms and ions in solids; optical properties of solids. Part 2 Energy levels of free atoms and of optical centres in crystals: electronic structure of one-electron atoms; transitions between stationary states; multi-electron atoms; optical centres in a static crystalline envrionment; energy levels of F centres and related defects; crystal field states of a single 3d electron. Part 3 Symmetry and group representation theory: fundamentals of group theory; multi-(3d) electron systems. Part 4 Radiative transition rates and selection rules: time-dependent perturbation theory; interaction between the electronic centre and the radiation field; spontaneous and stimulated optical transitions; selection rules and oscillator strengths in optical centres. Part 5 Electronic centres in a vibrating crystalline environment: lattice vibrations; coupled electron-lattice system; radiative transitions using the configurational coordinate model; the electron-lattice interaction in the weak coupling limit; vibronic processes in broad bands; phonon-induced relaxation processes; non-radiative transitions involving multi-phonon emission. Part 6 Experimental techniques: optical absorption spectroscopy; polarized absorption and luminescence; perturbation and laser spectroscopy; optically detected magnetic resonance (ODMR); Picosecond spectroscopy of solids. Part 7 Colour centres in ionic crystals: single vacancy centres in alkali halides and other crystals; vacancy aggregate centres; optical properties of trapped hole centres. Part 8 Spectroscopy of rare-earth and actinide ions in solids: energy levels and eigenstates of the 4fn electrons; selection rules for radiative transitions on rare-earth ions; specific trivalent rare-earth ions; emission from divalent rare-earth ions; defect site spectroscopy; spectroscopy of actinide ions; rare-earth ions in glass. Part 9 Optical spectroscopy of transition metal ions in solids: energy levels and radiative transitions on transition metal ions; non-radiative transitions on transition metal ions in solids; spectroscopy of Cr3+ (3d3) ions; other transition metal ions; transition metal ions in glass. Part 10 Spectroscopy at high dopant concentrations: energy transfer between optically active ions; theoretical analysis of energy transfer; cooperative behaviour, upconversion schemes; multi-centre complexes; fully concentrated materials. Part 11 Solid state lasers: optically pumped three-level lasers; tunable vibronic lasers; production of ultra-short pulses. Part 12 Optical detection of magnetic resonance: ODMR of 3d3 ions; ODMR in the triplet state of defects in insulators; phosphor ions in alkali halides; exciton recombination in crystals; donor-acceptor recombination in semiconductors; spin memory effects in ODMR; optical-microwave coherence spectroscopy.