![]() This and other results demonstrated the influence of the original ionization density on the molecular yield. In 1948, Bonet-Maury and Lefort showed that α-rays produced hydrogen peroxide independent of the dissolved dioxygen concentration whereas this hydrogen peroxide yield depended strongly on the dioxygen concentration in the case of X-ray irradiation. It is worth stressing that the presence of the solvated electron had been theoretically invoked by Stein in 1952, by Platzman in 1953 and by Weiss in 19. The authors detected a real transient optical absorption around 700 nm and the analogy of the spectrum to that of the electron in ammonia convinced them that it was the solvated electron. ![]() The final confirmation of the presence of a solvated electron-through observation of its transient absorption spectrum-by means of pulse radiolysis arose in 1962 from Hart and Boag’s experiments, even if Keene may have observed it first. By 1960, several facilities had achieved the possibility to perform pulsed electron radiolysis, which is the equivalent of flash photolysis in the field of radiation chemistry. ![]() Nevertheless, this was only indirect proof. showed, by studying reactions as a function of the ionic strength, that H’ had a unit negative charge, leading to the conclusion that this specie was the hydrated electron. Two reducing species, labeled as H and H’, were used then. It then became clear that the fate of the oxidizing species was satisfactorily described, which was not the case for the reducing species. After World War II, the mechanism of the radiolysis of water focused on the H
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