Radiolysis of Aqueous Solutions with Pulsed Ion Beams. 4. Product Yields for Proton Beams in Solutions of Thiocyanate and Methyl Viologen/Formate
Radiolysis of Aqueous Solutions with Pulsed Ion Beams. 4. Product Yields for Proton Beams in Solutions of Thiocyanate and Methyl Viologen/Formate
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用脉冲离子束辐射分解水溶液。
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. LaVerne
中科院分区：
文献类型：
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作者：
N. Chitose;Y. Katsumura;Masafumi Domae;Z. Cai;Y. Muroya;and Takeshi Murakami;J. LaVerne
使用5.2 MeV能量的质子脉冲，从水分解产生的自由基的产率的两种类型的水溶液，硫氰酸盐和甲基紫精（MV 2+）的辐解测定。在浓度范围为0.001 - 0.75 M的硫氰酸盐溶液中，通过清除OH自由基产生的（SCN）2·-的产率低于高能电子，高于21 MeV能量的4 He离子。（SCN）2·-产率随着硫氰酸根浓度的增加而增加，但在质子辐解中，硫氰酸根自由基的衰变似乎是实质性的。甲基紫精自由基阳离子（MV·+）清除eaq-，H原子，和OH自由基形成的测定在脱气的0.5 mM MV 2+含有甲酸盐的解决方案。MV·+产额与稳态质子束辐解的结果一致，这证实了早期的结果，该系统是一个合适的离子束脉冲辐解的化学剂量计。脱气MV ~（2+）中MV·~（2+）的产率为100%。
The yields of radicals from water decomposition produced in the radiolysis of two types of aqueous solutions, thiocyanate and methyl viologen (MV2+), were determined using proton pulses of 5.2 MeV energy. Aerated thiocyanate solutions in the concentration range of 0.001−0.75 M gave yields of (SCN)2•-, formed from scavenging OH radicals, that were lower than those for high-energy electrons and higher than those for 4He ions of 21 MeV energy. The (SCN)2•- yield increased with increasing thiocyanate concentration, but the decay of thiocyanate radicals through intratrack reactions appears to be substantial in proton radiolysis. Methyl viologen radical cations (MV•+) formed by scavenging eaq-, H atoms, and OH radicals were measured in deaerated 0.5 mM MV2+ solutions containing formate. The MV•+ yields agreed with the results of steady-state proton beam radiolysis, which confirms earlier results that this system is a suitable chemical dosimeter for ion beam pulse radiolysis. The yields of MV•+ in deaerated MV2+...