1. Some remarks about free radicals and the photochemistry of solutions
2. The collison mechanism and the primary photochemical process in solutions
3. Collision, co-ordination, diffusion and reaction velocity in condensed systems
4. In addition to recombination and diffusive separation, the chemical reactions of cage pairs can include disproportionation, isomerizations, fragmentations, electron transfer, in-cage trapping, etc. For the metal–radical cage pairs in this paper, the only chemical process is kc.
5. T. Koenig, in: W.A. Pryor, (Ed.), Organic Free Radicals, ACS Symposium Series, vol. 69, 1978 (Chapter 9).