Titlebook: New Horizons of Quantum Chemistry; Proceedings of the F Per-Olov L?wdin,Bernard Pullman Conference proceedings 1983 D. Reidel Publishing Co

LINE

Conference proceedings 1983tri- butions were given some plenary time. These proceedings contain the text of the plenary lec- tures as well as the chairmen‘s introductions, whereas the contributed papers will be published in the International Journal of Quantum Chemistry, (John Wiley & Sons, New York) in the regular January - April 1983 issues.

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BROOK

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Time Dependent Constants of the Motionarticular experimental situation is emphasized. Particular attention is given to the situation where the true Hamiltonian is unknown and experimental input is used to identify the time dependent constants.

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Accommodation

Degenerate Perturbation Theoryms as the most efficient. Recent developments include coupled-cluster formulations for open shells, a new diagrammatic representation, and the concept of incomplete model subspaces. These subjects are reviewed, as well as some applications.

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Nonadiabatic Effects in Slow Atomic Collisions — Many-Trajectory Semiclassical Approximationlecular adiabatic terms along local common trajectories. To this approximation the differential cross section displays interference effects: generalized Stueckelberg undulations, generalized rainbow undulations, and the slow modulation of rapid undulations due to the relative dephasing of waves scattered on a degenerate molecular term.

Colonnade

The Unitary Group and the Electron Correlation Problemurpose, and methodology of its application to this problem. As much as possible, this discussion is on a mostly intuitive, non-technical level. Finally, recent accomplishments and expected future developments are briefly mentioned.

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