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Report No.
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Research and application of positronium chemistry

Hirade, Tetsuya

The researches and the applications of the Positronium Chemistry were introduced. The mechanism of Ps formation in low temperature insulators was clarified by Hirade and it is almost the end of the long, more than half century, period for arguments on Ps formation. Hence almost all of the researchers have been accepting the Spur Reaction Model proposed by Mogensen. Therefore, radiation chemistry researches by use of the Spur Reaction Model, especially the study of excess electrons at the time range of pico-to-nano second and electron mobility, were introduced. It was also introduced that the Free Volume Model is not correct and then the sub-nano meter vacant space, such as the microscopic free volume in polymers, can be studied by just the triplet Ps lifetime. As the latest research for the application, it was introduced that Ps bubble shows oscillation especially in ionic liquids and is expected to be a strong tool to investigate nano-scale properties of ionic liquids.

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