Aspects of Many-Body Effects in Molecules and Extended Systems

This volume features invited lectures presented in the workshop-cum-symposium on aspects of many-body effects in molecules and extended systems, Calcutta, February 1 - 10, 1988. The organizers invited leading experts to present recent developments of many-body methods as applied to molecules and condensed systems. The panorama portrayed is quite broad, but by no means exhaustive. The emphasis is undoubtedly on a "molecular point of view".

I. Separability in Many-Electron Problem: Size Extensivity and Size-Consistency. - Separability Problem in General Many-Electron Systems. - Quantum Chemistry in Fock Space. - Size Extensivity Correction for CI Energies Based on Complete Active Space Reverence Functions. - II. Many-Body Perturbation Theory and Coupled-Cluster Theory of Atomic and Molecular Electronic Structure. - Dynamic Variational Principles Extended Coupled Cluster Techniques. - SAC-CI Calculations of the Excited and Ionized States of Conjugated Molecules. - Atomic and Molecular Application of Effective Hamiltonian Formalism in Complete and Incomplete Model Spaces. - Applications of Multi-Reference Coupled-Cluster Theory. - Applications of the Open-Shell Coupled-Cluster Method. - An Explicitly Connected MBPT for Incomplete Model Space. - III. Propagators in Bound States and Resonances. - Propagators for Molecular Electronic Spectra. - Transition Moments in RPA-like Approximations. - Application of One Electron Propagator Method in the Treatment of Resonances. - IV. Condensed Matter and Related Topics. - Quantum Fluid Dynamics: An Extended Coupled-Cluster Treatment. - Quasiparticles in Extended Systems A Coupled-Cluster Approach. - Electronic Structure and Spectra of Polyenes. - Proton Transfer in Water and Ice: Solitonic Models for Structural Defects in the Hydrogen-Bonded Network. - V. Many-Body Methods in Dynamical Processes. - On the Development of Time Dependent Cluster Expansion Techniques for Molecular Dynamics. - Electrochemical Electron Transfer: Accounting for Non-Adiabaticity Using a Bosonised Hamiltonian. - VI. Relativistic Methods with Applications. - Generalization of Kato s Cusp Conditions to the Relativistic Case. - Relativistic and Non-Relativistic Many-Body Procedure, Applied to Atomic Systems. -Relativistic Equations of Motion Method. - Relativistic Many-Body Theory of Electric Dipole Moment of Atoms due to Parity and Time-Reversal Violation. - VII. Group-Theoretic Techniques. - Spinor Basis in Electron Correlation Studies. - On the Unitary Group and Associated Operators. - VIII. Few-Body Methods, Large-N Expansion and Other Mathematical Topics. - Hyperspherical Harmonics Methods for Few-Many-Body Problems. - Large-N Expansions. - Application of Catastrophe Theory to Molecules. - IX. Densities and Density-Functionals. - Modern Developments in the Energy Density Functional Theory of Many-Electron Systems. - Interconnections between Electron Densities in Position and Momentum Spaces. - Aspects of Density Functional Approach to Many-Electron Systems. - List of Participants.