Theory of Light Scattering in Condensed Matter: Proceedings of the First Joint USA-USSR Symposium. Questo articolo non è disponibile.Theory of Light Scattering in Condensed Matter: Proceedings of the First Joint USA-USSR Symposium

The First Binational USA-USSR Seminar-Symposium on the Theory of Light Scattering in Condensed Matter was held in Moscow 26-30 May 1975. The initial conception for a light scattering seminar of about fifty scientists - half from each side, including theorists and experimenters "well versed in theory" - arose from discussions between Professor J. L. Birman and Professor K. K. Rebane at the 1971 Paris International Conference on Light Scattering in Solids. This conception won approval among the active scientists on both sides. After considerable planning and some delays, it received both material support and encouragement from the appro­ priate organizations on each side: in the USA: The National Science Foundation (Division of International Programs), and the National Academy of Sciences; in the USSR: the Academy of Sciences USSR. A variety of reasons contributed to the positive response on both sides: for example, the considerable and high level of theoretical and experimental scientific activity on both sides in laser-related light scattering, optics, and generally - electro­ dynamics of condensed media - some along rather similiar lines; the impediments to free and easy communication and travel be­ tween USA and USSR scientists working on related problems; plus the desire to improve both contacts, and the free flow of informa­ tion and individuals, to the mutual advantage of both sides.

Section I Phase Transitions and Liquid Crystals.- Light Scattering in the Vicinity of Phase Transition Points in Solids.- Comment.- Critical Opalescence at Structural Phase Transitions.- Raman Spectra and Structural Phase Transitions in Improper Ferroelastics Hg2Cl2 and Hg2Br2.- Measurement of Liquid Crystal Orientational Statistics by Raman Scattering.- The Van der Waals Forces and Light Scattering in Liquid Crystals.- Section II Strong Anharmonicity Effects and Electron-Phonon Interaction in Crystals.- Quasiparticle Interactions in Many-Body Systems.- Weakly-Bound Excitation States in Crystals.- Polariton Fermi-Resonance in the Raman Spectrum of Ammonium Chloride.- Light Absorption and Scattering by Nonlinear Local and Quasi-Local Oscillation.- Intervalley Phonon Raman Scattering in Many-Valley Semiconductors.- Section III Scattering from Electrons and Electron-Hole Drops.- The Investigation of Exciton Condensation in Germanium by the Light Scattering Method.- Experiments on Light Scattering from Electron Hole Drops in Germanium.- Comment.- Inelastic X-Ray Raman Scattering.- Raman Scattering by Local Plasmons and Electron-Hole Drops.- Raman Scattering in Metals and Heavily Doped Semiconductors.- Section IV High Intensity and Non-Linear Effects.- Interaction of Electromagnetic Waves with Free Electrons.- Relation Between Light-Scattering Cross-Sections and the Nonlinear Optical Susceptibilities of Liquids and Solids.- Comments.- Theory of Light Scattering from Light in Molecular Crystals.- Coherent Active Spectroscopy of Raman Scattering: Comparison with Spectroscopy of Spontaneous Scattering.- Raman Scattering Induced by Strongly Nonequilibrium Phonons.- Multiphonon Raman Scattering in Semiconducting Crystals.- Light Scattering as a Method of Studying the Transformation of Incoherent Phonon Flux into a Coherent Acoustical Signal.- Section V Bulk and Surface Polaritons.- Excitons, Polaritons and Light Absorption in Crystals.- Neutron Scattering and Absorption by Laser Photons in Crystals.- Spatial Dispersion and Damping of Plasmon-Phonon Modes in Semiconductors.- The Scattering of Light from Surface Polaritons: Line Intensities and Line Shapes.- Comment.- Comment.- Light Scattering in Crystals with Surface Corrections.- Section VI Resonance Scattering and Scattering from Local Excitations.- On the Theory of Resonant Secondary Radiation: Scattering, Luminescence and Hot Luminescence.- Comment.- Comment.- Resonant Raman Scattering Near Excitonic Transitions.- Symmetry Effects in Resonance Scattering.- Light Absorption and Raman Scattering by Phonons Bound to Impurity Centres.- Section VII Scattering from Electronic Excitations and Spin-Flip Processes.- Some Features of Light Raman Scattering by Bulk Polaritons.- Electronic Raman Scattering.- Theory of Spin-Flip Line Shape in CdS.- Interaction Between the Low Frequency Branches of a Crystal’s Energy Spectrum Near Phase Transitions.- Section VIII Scattering by Superfluids.- Tricritical Points and Light Scattering in He3-He4 Mixtures.- Critical Scattering of Light by a Two-Component Fluid.- On the Influence of Impurities on Light Scattering at Phase Transitions.- Comment.- Concluding Remarks.- Concluding Remarks.- Author Index.- Topical Index.