期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 120, 期 2, 页码 200-209出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.5b12281
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-FC02-04ER15533]
Molecular hydrogen is a primary product of the interaction of low-LET (gamma, beta) radiation with water, and previous measurements have shown that its initial yield increases at elevated temperature. This has been the subject of controversy because more atomic H and (e(-))(aq) free radicals escape recombination at elevated temperature, and the corresponding production of H-2 should decrease. Room temperature experiments have demonstrated that a large fraction of H-2 also comes from early physicochemical processes (presumably electron-hole charge recombination and/or dissociative electron attachment), which can be suppressed by scavenging presolvated electrons. In the present work we extend these scavenging measurements up to 350 degrees C to investigate why the H-2 yield increases. We find that most of the H-2 yield increase is due to the presolvation processes. Relatively small changes in the scavenging efficiency vs LET, and a significant effect of temperature depending on the (positive or negative) charge of the scavenger, indicate that the presolvation H-2 is dominated by electron hole charge recombination rather than dissociative electron attachment at all temperatures.
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