TRANSLATIONAL DIFFUSION OF INTERMEDIATE SPECIES IN SOLUTIONS

In this article, applications of the TG method to measurements of the translational diffusion of photochemically created intermediate specie s are reviewed. The intermediate species include unstable isomers, pho tochromic charged molecules, transient radicals created by photochemic al reactions, and the electronically photoexcited species. Diffusional behaviors of these intermediates are different from those of stable m olecules, which have been investigated extensively so far. The investi gations of the diffusion of these species will provide opportunity to reveal the unique intermolecular interaction between the intermediates and matrix. Furthermore, by using products of photochemical reactions as probe molecules, the molecular dynamics of the system can be studi ed. This information will be valuable for understanding photochemistry in solution.