The nature of the precursors of radiolytic molecular hydrogen in water, and the mechanism of positronium formation in liquids

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI:10.1016/0020-7055(76)90071-1

V.M. Byakov

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引用次数: 36

Abstract

The dependence of H₂ yields on the concentration of certain solutes indicates that molecular hydrogen is formed via recombination of its precursors in spurs. The order of efficiency of solutes in decreasing the formation of H₂ does not correlate with the rate constants of their reactions with e_aq⁻ or H.

Due to their diffusive motion at energies ⩽10²eV and to their comparatively long lifetimes in the subvibrational energy range at the end of their tracks, positrons may form positronium by a reaction with (epi) thermal electrons. The order of the reactivity of solutes towards the precursors of positronium is the same as that towards precursors of the molecular hydrogen yield and is in agreement with the order of their relative rate constants towards the non-solvated electron.

It seems that the non-solvated electron takes part in the formation of positronium and of radiolytic H₂.

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水分子氢的放射性分解前体的性质，以及液体中正电子的形成机制

H2产率与某些溶质浓度的关系表明，分子氢是通过其前体在马刺中的重组形成的。溶质降低H2生成的效率的顺序与其与eaq -或h的反应速率常数无关。由于正电子在能量≥102eV时的扩散运动，以及它们在轨迹末端的亚振动能量范围内相对较长的寿命，正电子可以与(epi)热电子反应形成正电子。溶质对正电子前体的反应性顺序与分子产氢前体的反应性顺序相同，并与它们对非溶剂化电子的相对速率常数顺序一致。非溶剂化电子似乎参与了正电子和辐射分解H2的形成。

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International Journal for Radiation Physics and Chemistry

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