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