10.8 Kinetics of reactions in solution (2)Theoretical model-solvent cage SOME REMARKS ABOUT FREE RADICALS AND THE PHOTOCHEMISTRY OF SOLUTIONS BY PROFESSOR J. FRANCK AND DR. E. RABINOWITSCH(Gottingen) Ill. Secondary Recombination and the Temperature- Coefficient. The equilibrium concentration of free atoms or radicals in a solution as compared with a gas, is affected not only by a decreased rate of forma- tion and the possibility of "primary recombination "but also by an increased probability of norm or“ secondary"” recombination, resulting from the fact that every collision of two radicals or atoms in solution is made a"triple "or"multipl ole ) collis ision by the presence the molecules of the solvent. Thus the velocity of normal recombina- tion will in every solution be greater by the factor I03 to Iof than it i in a gas at atmospheric pressure. J. Franck and E Rabinowitch, Trans. Faraday Soc., 1934, 30: 120(2) Theoretical model—solvent cage 10.8 Kinetics of reactions in solution J. Franck and E. Rabinowitch, Trans. Faraday Soc., 1934, 30: 120