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• W3166159311 abstract "In this study, we use Monte Carlo track chemistry simulations to show that dry secondary electrons, precursors of the hydrated electron (e^-_aq), can be scavenged on the sub-picosecond time scale prior to hydration, by a high concentration (>0.1-1 M) of azide ions (N₃^-) in water irradiated with ⁶⁰Co γ-rays and ³H β-electrons at 25 °C. This is a striking result, as N₃^- is known to react very slowly with e^-_aq. These processes tend to significantly reduce the yields of H₂ as observed experimentally. For both energetic Compton electrons (linear energy transfer, LET ∼ 0.3 keV/μm), which are generated by the cobalt-60 γ-rays, and ³H β-electrons (LET ∼ 6 keV/μm), our H₂ yield results confirm previous Monte Carlo simulations, which indicated the necessity of including the capture of the precursors to e^-_aq. Interestingly, our calculations show no significant changes in the scavenging of dry electrons at high azide concentrations in passing from γ-radiolysis to tritium β-radiolysis (<i>i.e.</i>, with LET). This led us to the conclusion that the higher H₂ yield observed experimentally for ³H β-electrons compared to ⁶⁰Co γ-rays is explained mainly by the difference in the radiation track structures during the chemical stage (>1 ps). The higher LET of tritium β-electrons leads to more molecular products (H₂ in this case) in tritium radiolysis than in γ-radiolysis. Finally, a value of 0.5 nm was derived for the reaction distance between N₃^- and the “dry” electron from the H₂ yields observed in ⁶⁰Co γ-radiolysis at high N₃^- concentrations." @default.
• W3166159311 created "2021-06-22" @default.
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• W3166159311 date "2021-06-07" @default.
• W3166159311 modified "2023-09-26" @default.
• W3166159311 title "Scavenging of dry electrons prior to hydration by azide ions: Effect on the formation of H₂ in the radiolysis of water by ⁶⁰Co γ-rays and tritium β-electrons." @default.
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• W3166159311 doi "https://doi.org/10.1139/cjc-2020-0504" @default.
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