Yield and decay of the hydrated electron from 100 ps to 3 ns
Yield and decay of the hydrated electron from 100 ps to 3 ns
复制标题
水合电子从 100 ps 到 3 ns 的产率和衰变
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
E. Hart
中科院分区：
文献类型：
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作者：
C. Jonah;M. Matheson;John R. Miller;E. Hart
能量是由水中的快速电子以小的局部体积沉积的，这种体积被称为马刺。在100 ps和3 ns之间，已测得水化电子在支线中的衰减约为17%。这种衰减的一半发生在700 ps之前，其中以前的技术不能观察到任何衰减。推测刺中水合电子的主要反应为e/sup -//sub aq/ + e/sup -//sub aq/、e/sup -//sub aq/ + H/sup +/和e/sup -//sub aq/ + OH。氢离子的清除剂在减缓衰变方面与羟基自由基的清除剂大约同样有效，但OH/sup -/似乎异常有效。这表明H/sup +/和OH相对于e/sup -//sub aq/类似地分布。还观察到电子捕获产物Cd/sup +/或RSSR/sup -/（其中RSSR为胱胺）的Spur衰变。这些观测结果使测量初始水合电子产额的不同方法相一致，达到4.6 +- 0.2分子/100 eV，并与我们以前的数据相结合，提供了从100 ps到实现均匀分布的spur中e/sup -//sub aq/历史的主要特征。
Energy is deposited by fast electrons in water in small localized volumes called spurs. The decay of the hydrated electron in a spur has been measured to be about 17 percent between 100 ps and 3 ns. Half of this decay occurs before 700 ps where previous techniques could not observe any decay. The principal reactions of the hydrated electron in the spur are presumed to be e/sup -//sub aq/ + e/sup -//sub aq/, e/sup -//sub aq/ + H/sup +/, and e/sup -//sub aq/ + OH. Scavengers for the hydrogen ion are about equally effective in slowing the decay as are scavengers for the hydroxyl radical except for OH/sup -/ which seems unusually effective. This suggests H/sup +/ and OH are distributed similarly with respect to e/sup -//sub aq/. Spur decay is also observed for the products of electron capture, Cd/sup +/ or RSSR/sup -/, where RSSR is cystamine. The observations reconcile different methods for measurement of the initial hydrated electron yield to 4.6 +- 0.2 molecules/100 eV, and combined with our earlier data, provide the major features of the history of e/sup -//sub aq/ in the spur from 100 ps to the achievement of a homogeneous distribution.