Content: Spin-statistical factors in diffusion-controlled reactions / Jack Saltiel and Beauford W. Atwater — Photochemistry and molecular motion in solid amorphous polymers / James Guillet — Photochemistry of simple olefins: chemistry of electronic excited states or hot ground states? / Guy J. Collin — The decomposition of alkyl nitrites and the reactions of alkoxyl radicals / Julian P. Heicklen — Photchemistry in surfactant solutions / Gu?nther von Bu?nau and Thomas Wolff