72 



BURTON: What is he irradiating with? 



GARRISON: X rays. 



PLATZMAN: Measuring decomposition? 



GARRISON: Yes. 



KASHA: How much can you vary the relaxation time by just changing the 

 temperature of the water at high pressure from zero to 200 C, C. ? 



ONSAGER: You can cut it down quite a bit. 



HOCHANADEL: Some work has been started by Ellison Taylor at the Oak 

 Ridge National Laboratory on radiation effects in frozen glycerol and other 

 glassy solvents in an attempt to learn something about the nature and number of 

 unstable species, such as free radicals or trapped charges produced by the ra- 

 diation at low temperature. A considerable study was made of the effects of 

 radiation on solutions of methylene blue in frozen glycerol. Also, some work 

 was done with frozen aqueous solutions of methylene blue and solutions of fer- 

 rous thiocyanate. An interesting observation concerning radiation effects in 

 aqueous solution was that the yield of ferro thiocyanate observed on melting a 

 solution of ferrous thiocyanate irradiated in the solid state at low temperature 

 was greater than that for solution irradiated in the liquid state. 



ONSAGER: Did he use water? 



HOCHANADEL: Yes, some frozen aqueous solutions were studied. 



ALLEN: I should like to come back to Dr. Kasha's question about reducing 

 the relaxation time by heating up the water. What is the experimental effect you 

 should look for if you irradiate the water, say, at 100°or 200° instead of 20°? 

 What would be the experimental effect? 



BOAG: With a greater relaxation time there would be a probability of the 

 electrons becoming attached at greater distances from their parent ions. Thus, 

 "preferential" recombination would be reduced and this change might be detec- 

 table. 



ALLEN: Do you think the radicals would be formed further out because the 

 "preferential" recombination could become less probable? 



BOAG: Yes; if the electrons become attached further out, the radicals will 

 be formed there in accordance with the view which Dr. Platzman put forward 

 earlier. 



BURTON: That is, of course, if the energy produced in the capture process 

 is sufficient to cause dissociation of the negative ion. Electron capture does not 

 necessarily mean dissociative capture. It is possible that, unless solvation of 

 a product contributes to the energy requirement, the solvated electron may not 

 survive long enough to enter into a dissociative process. 



ALLEN: H^O will act chemically the same as H atoms, I think. 



MAGEE: It is not known that there is such a thing. 



ALLEN: So you should get a bigger value of this Gr and a smaller value of 



