Surface-dynamics of growing crystals -- Electronic properties, chemical bonding, and lattice dynamics of semiconductors -- The role of electron-hole interaction in the optical spectra of semiconductors and insulators -- Fine structure, lineshape, and dispersion of wannier excitons -- Extended phase diagrams of excited semiconductors -- Optical boundary value problem in spatially dispersive media -- Defects in surface structure: Informations with LEED -- Theoretical aspects of photoemission -- Angel-resolved photoemission -- Spin polarization of photoelectrons emitted from ferromagnets -- Imperfections and photoconductivity -- Electronic structure of localized defects in covalent semiconductors -- Hopping conduction and the Coulomb gap; applications to Fe3O4, Ti4O7 and impurity conduction in Si:P -- Non-equilibrium superconductivity -- Picosecond spectroscopy: Methods and applications -- Progress in tunable lasers -- Fluorescent planar collector-concentrators for solar energy conversion.