The articles collected in this volume give a broad overview of the current state of surface science. Pioneers in the field and researchers met together at this Solvay Conference to discuss important new developments in surface science, with an emphasis on the common area between solid state physics and physical chemistry. The contributions deal with the following subjects: structure of surfaces, surface science and catalysis, two-dimensional physics and phase transitions, scanning tunneling microscopy, surface scattering and surface dynamics, chemical reactions at surfaces, solid-solid interfaces and superlattices, and surface studies with synchrotron radiation. On each of these subjects an introductory review talk and a number of short research contributions are followed by extensive discussions, which appear in full in the text. This nineteenth Solvay Conference commemorates the 75th anniversary of the Solvay Institutes.

Inhalt
Opening Remarks.- I The Structure of Surfaces.- Calculation of Surface Structural Energies.- A New Model for the Cleaved Si (111)-(2xl) Surface.- Diffuse LEED, Tensor LEED, and the Structure of Random Adsorbates.- Surface Structure Study by High-Resolution Electron Microscopy and Diffraction.- Complete Surface Structures.- II Surface Science and Catalysis.- The Activation of Chemical Bonds at Surfaces.- Collision Induced Dissociation and Desorption: CH4 on Ni(111).- Associated Effect in Adsorbed Layer.- The Surface Chemical Bond of Adsorbed Organic Monolayers and Adsorbate-Induced Restructuring of Surfaces.- The Atomic Structure of the Liquid-Vapor Interface of a Metal: An Example of the Influence of Strong Density Dependence of the Interatomic Potential.- III Two-Dimensional Physics/Phase Transitions.- Phase Transitions at Interfaces: Roughening, Surface Melting, and Triple Point Wetting.- Theory of Surface Melting and Non-Melting.- Is a Liquid Supported Amphiphile Monolayer Aptly Described as a Two-Dimensional System?.- Measurement of Non-Equilibrium Diffusion from Two-Dimensional Ordering Kinetics.- Metastable Magnetic Epitaxial Thin Films.- IV Scanning Tunneling Microscopy.- Tunneling Microscopy.- Theory of Single-Atom Imaging in the Scanning Tunnelling Microscope.- Electronic Processes at Disordered Surfaces.- Recent Results in Scanning Tunneling Microscopy.- Preliminary Studies on the Interface Structures of CaF2/Si(111).- Spectroscopic Imaging of Surfaces with Atomic Resolution.- V Surface Scattering and Surface Dynamics.- The Study of the Forces Between Atoms of Single Crystal Surfaces from Experimental Phonon Dispersion Curves.- Self-Consistent Theory of Surface Phonon Dispersion Curves at the (110) Surface of Aluminum.- Carrier Excitation Yield from Atomic Collisions at Semiconductor Surfaces.- Simulation Studies of Structure and Vibrations of Clean Transition Metal (001) Surfaces Across the Reconstruction Phase Transition.- Soluble Models in Surface Collision Dynamics.- VI Chemical Reactions at Surfaces.- Dynamics of Chemical Interactions at Surfaces.- The Photochemistry of Methyl Halides Adsorbed on Pt(111).- Hydrogen Spillover on Oxide Surfaces.- The Sticking of Ne on Ru(001): Quantum vs. Classical Behavior.- Atomic and Electronic Structure of Compound Semiconductor Interfaces.- VII Solid-Solid Interfaces and Superlattices.- Solid-Solid Interfaces and Superlattices.- Electronic Structures of Strained Layer Superlattices (Si)m/(Si1-xGex)m(100) with m=1 and m=2n (n=1-10).- First-Principles Calculations of Quasiparticle Energies at Surfaces and Interfaces: Semiconductor Surface-State Spectra and Band Offsets.- Comparison of Interfacial Charge Densities, Valence Band Offsets, and Formation Enthalpies of (GaAs)n(AlAs)n(001), (110), and (111).- Surface Segregation at Metal/m-V Compound Semiconductor Interfaces.- VIII Surface Studies with Synchrotron Radiation.- Dynamical Response of a Metal Surface.- Advances in Surface Crystallography by Multishell SEXAFS.- Chemical Effects in Surface-Enhanced Raman Scattering.- Magneto-Optic Kerr Effect Studies of Two-Dimensional Magnetism.- Surface vs. Bulk Hysteresis Loops.- Near Edge X-Ray Absorption Fine Structure (NEXAFS) of Molecules Adsorbed on Surfaces.- High Resolution Core Level Shift Spectroscopy from Tungsten Single Crystal Planes.- Surface Spectroscopy of High-Tc Y-Ba-Cu-O Superconductors.- Administrative Council and Scientific Committees of the Solvay Foundation.- Organizing Committee of the Solvay Conference.- List of Participants.- Index of Contributors.