Multiradical Diffusion Models

Re-formation of water must be considered somewhat arbitrarily. However, these models have been generally useful in delineating LET and scavenger effects on the total molecular yield. 

Kuppermann and Belford (1962b) also performed 2-radical calculations using a reaction scheme and numerical procedure similar to Dyne and Kennedy however, their stated purpose was not the obtaining of agreement 

Chapter 7 Spur Theory of Radiation Chemical Yields 

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Discovery of the hydrated electron and pulse-radiolytic measurement of specific rates (giving generally different values for different reactions) necessitated consideration of multiradical diffusion models, for which the pioneering efforts were made by Kuppermann (1967) and by Schwarz (1969). In Kuppermann s model, there are seven reactive species. The four primary radicals are eh, H, H30+, and OH. Two secondary species, OH- and H202, are products of primary reactions while these themselves undergo various secondary reactions. The seventh species, the O atom was included for material balance as suggested by Allen (1964). However, since its initial yield is taken to be only 4% of the ionization yield, its involvement is not evident in the calculation. 

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