I. Spectroscopy, Structure, Potentials.- A. Rotational Spectra.- Rotational Spectroscopy of Weakly Bound Complexes: Capabilities and Limitations.- Pulsed-Nozzle, Fourier-Transform Microwave Spectroscopy of Hydrogen-Bonded Dimers.- Structure Determination of Weakly Bound Complexes.- Microwave Spectra and Weak Intramolecular Hydrogen Bonding in 3-Butene-1-Thiol and N-Methylallylamine.- B. Rotation-Vibrational Spectra.- High Resolution Infrared Spectroscopy of van der Waals Molecules.- Vibration-Rotation Spectroscopy of ArHCl by Far-Infrared Laser and Microwave/Far-Infrared Laser Double Resonance Spectroscopy.- Vibrational Anomalies and Dynamic Coupling in Hydrogen-Bonded van der Waals Molecules.- Slit Jet IR Absorption Spectroscopy of Molecular Complexes.- Sub-Doppler Resolution Infrared Spectroscopy of Binary Molecular Complexes.- The Infrared Spectrum of H2-Ar: New Observations in the v=l-0 and 2-0 Bands of H2.- Dynamical Properties of Simple Hydrogen-Bonded Clusters.- Infrared Spectroscopy of Hydrogen-Bonded and van der Waals Complexes.- Ab Initio Calculations of Vibrational Frequencies and Infrared Intensities for the Hydrogen- Bonded Complex HCN—HF.- The Role of Tunneling Models in Analyzing High- Resolution Spectra of Weakly Bound Molecular Complexes.- Bibliography of Rotational Spectra of Weakly Bound Complexes.- C. Electronic Spectra.- Structure and Dynamics of Mercury van der Waals Complexes.- The Structure of van der Waals Molecules of s-Tetrazine.- Spectra of Mixed Dimers.- Solvent Shifts, Spectroscopy and Structure in van der Waals Complexes of Perylene.- Spectroscopy in the Visible and Near Ultraviolet Region of Some Organic Molecules and their van der Waals Complexes.- Supersonic Jet Spectroscopy of Complexes of Carbazole and N-Ethyl Carbazole with Alkyl Cyanides.- Photoionization of Hydrogen-Bonded Molecular Aggregates.- D. Potential Functions.- The Unavoidable Importance of Electrostatic Effects in the Structures of Weakly Bonded Complexes.- Intermolecular Potentials, Internal Motions and the Spectra of van der Waals Molecules.- Non-Bonding Atom-Diatom Potentials via a Double Many-Body Expansion Method.- The Determination of Intermolecular Forces by Data Inversion Methods.- Transport Properties of van der Waals Molecules Computed from Accurate Interactions.- Determination of Anisotropic Interaction Potentials from Rotational State Resolved Scattering Data.- van der Waals Interactions from Glory and Diffraction Scattering.- High Resolution Crossed Molecular Beam Studies of van der Waals Forces.- E. Summary: Part.- Where Are We in Weak Intermolecular Interactions?.- II. Dynamics.- Interpretation of Linewidths in the Infrared Photodissociation Spectra of van der Waals Molecules.- Infrared Photodissociation of van der Waals Complexes Selectively Prepared by Molecular Beam Scattering.- IR Dissociation of Weakly Bound van der Waals Complexes: (SF6)n, (SiF4)n, (SiH4)n, (C2H4)n,(n=2,3) in the 9–11 in ?m Range.- Infrared (9–11?m) Dissociation of the Hydrogen Bonded Clusters (NH3)n (n?2)Detected by Bolometric Technique.- Highly Excited Systems.- Vibrational Predissociation Dynamics of the Nitric Oxide Dimer.- Complex Forming Reactions in Noble Gas Clusters.- Structure and Dynamics of the Rare Gas-Halogen van der Waals Molecules: Product State Distributions for Vibrational Predissociation of NeBr2.- Dynamics of Energy Transfer in van der Waals Molecules of s-Tetrazine and Argon.- Theory of van der Waals Photofragmentation Dynamics.- Dissociation Dynamics of the He-I2-Ne van der Waals Complex.- Dynamics of the Ar---H2 van der Waals Complex: A Diabatic Distorted Wave Approach Including Discrete-Discrete Couplings.- Vibrational Predissociation Dynamics of Weakly Bonded Dimers: A Summary.- List of Participants.- List of Contributors.- List of Poster Papers.- List of Names.