Large Finite Systems Proceedings of the Twentieth Jerusalem Symposium on Quantum Chemistry and Biochemistry Held in Jerusalem, Israel, May 11–14, 1987

The Twentieth Jerusalem Symposium reflected the high standards of these distinguished scientific meetings which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The Twentieth Jerusalem Symposium marked an auspicious occasion. commemorating two decades of this scientific endeavour. The topic at this year's Jerusalem Symposium was Large Finite Systems which constitutes a truly interdisciplinary subject of central interest in the broad areas of chemistry. physics. astrophysics and biophysics. The main theme of the Symposium was built around bridging the gap between molecular. surface and condensed matter chemical physics. Emphasis was placed on the interrelationship between the properties of large molecules. van der Waals complexes and clusters. focusing on the structure. dynamics of nuclear motion. quantum and thermodynamics size effects. the nature of electronic states and excited-state energetics and dynamics of large finite systems. The interdisciplinary nature of these research areas was deliberated by intensive and extensive interactions between scientists from different disciplines and between theory and experiment. This volume provides a record of the invited lectures at the Symposium.

The Quantum Yield of Non-Resonant Light Scattering.- Excited States of Molecular Dimers.- Rotational Effects on Intramolecular Radiationless Transitions — “The Story of Pyrazine”.- The Dynamics of Polyatomic Molecules During and After Coherent Excitation.- Spectral Fluctuations in Finite Systems.- Time Dependent Quantum Mechanical Calculations of the Dissociation Dynamics of the Cluster Hen-I2.- Properties of Large Finite Systems: Constraints from Astrophysical Observations.- Porphyrin Dimers: The Photoexcited Triplet State as a Probe for Structure and Dynamics.- Coupling Between Locally Excited and Charge Transfer States of Jet Cooled Molecular Complexes.- Intermolecular Potential and Dissociation of Excited State Mercury Ammonia Complexes.- From Five-Fold to Crystalline Symmetry in Large Clusters.- Cluster Energy Surfaces.- Phase Changes: The Interplay of Dynamics and Equilibrium In Finite Systems.- Electron Localization in Water Clusters.- Rare-Gas Solvent Clusters: Order-Disorder Transitions and Solvent Shell Effects.- Spectra. Structure and Dynamics of SF6-(Ar)n Clusters.- Lasing and Stimulated Raman Processes in Spherical and Spheroidal Droplets.- Electron Attachment to Clusters.- Beams of Electrons Solvated in Clusters.- Theoretical Studies of Sodium Water Clusters: Their Ionization and Excitation Energies.- Isomerization in Alkali- Halide Clusters Induced by Electron Attachment.- Electron Localization by Atomic and Molecular Clusters.- Structural and Dynamical Properties of Clusters on a Substrate.- Photodissociatlon of Methyl Iodide Clusters.- The Yield of Exo-Electrons from Cluster Bombardment of Metallic Surfaces.- The Role of Large Oligomers in Designing Materials of Interest for their Electrical and Optoelectronic Properties.- Isolated, Bare MetalClusters: Abundances and Ionization.- Electronic Structure and Basic Properties of Small Alkali Metal Clusters.- Laser Spectroscopy of Matrix-isolated Clusters: Diatomic and Triatomic Manganese.- Small Dielectric Clusters: Size and Shape Dependence of Photophysicai and Photochemical Properties.- Fluids That Exhibit Changes in Electronic Structure.- Coherent Control and Laser Catalysis of Chemical Reactions.- Studies on the Structure of Porous Silicas: The Fractal Dilemma.- Doppler-Free Spectroscopy, an Opportunity for State Specific Investigations in Large Molecules.