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  • 1 Russian Academy of Sciences Semenov Institute of Chemical Physics 4 Kosygin str. Moscow 117334 Russia
  • | 2 High Energy Accelerator Research Organization (KEK) Radiation Science Center Tsukuba, Ibaraki 305-0801 Japan
  • | 3 High Energy Acceleration Research Organization Tsukuba Ibaraki 305-0801 Japan
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A bound state of positron (e+) and electron (e-) (positronium Ps) can be considered as a kind of hydrogen-like atom and the simplest free radical, which has a positron instead of a heavy nucleus. Annihilation g-radiation is in fact a label of this short-lived atom. Therefore, positronium chemistry is radiochemistry of the lightest short-lived labeled atom. Application of positronium chemistry to various chemical problems is essentially dependent on our knowledge of analogies and differences in the formation and chemical conversion of Ps, a atomic hydrogen, and other free radicals. In this review, experimental results of the authors and some other publications are briefly analyzed from this point of view.