Content: Advances in Photochemistry; Contents; Some Problems of Structure and Reactivity in Free Radical and Molecule Reactions in the Gas Phase; Mechanisms and Rate Constants of Elementary Gas Phase Reactions Involving Hydroxyl and Oxygen Atoms; Photochemical Reactions of Sulfur and Nitrogen Heteroatomic Organic Compounds; Photochemical Processes in Halogenated Compounds; The Chemistry of Ionic States in Solid Saturated Hydrocarbons; Preparation, Properties, and Reactivity of Methylene; Some Recent Developments in the Photochemistry of Organic Nitrites and Hypohalites. Phosphorescence and Delayed Fluorescence from SolutionsPhotoionization and Photodissociation of Aromatic Molecules by Vacuum Ultraviolet Radiation; Author Index; Subject Index; Cumulative Index