The description of quantum systems is fundamental to an understanding of many problems in chemistry and physics. This volume records a representative slection of the papers delivered at the second European Workshop on Quantum Systems in Chemistry and Physics which was held at Jesus College, Oxford, April 6-9, 1997. The purpose of this international Workshop was to bring together chemists and physicists with a common interest—the quantum mechanical many-body problem—and to encourage collaboration and exchange of ideas on the fundamentals by promoting innovative theory and conceptual development rather than improvements in computatorial techniques and routine applications. - Covers the following topics: - Density matrices and density functional theory - Electron correlation - Relativistic effects - Valence theory - Nuclear motion - Response theory - Condensed matter - Chemical reactions