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H$$_{6}$$$$^{+}$$, H$$_{5}$$D$$^{+}$$, H$$_{4}$$D$$_{2}$$$$^{+}$$, and H$$_{2}$$D$$_{4}$$$$^{+}$$ produced in $$gamma$$-ray irradiated solid para-H$$_{2}$$

$$gamma$$線照射した固体パラ水素中に観測された、H$$_{6}$$$$^{+}$$, H$$_{5}$$D$$^{+}$$, H$$_{4}$$D$$_{2}$$$$^{+}$$,及びH$$_{2}$$D$$_{4}$$$$^{+}$$の研究

熊田 高之   ; 熊谷 純*; 牛田 考洋*; 清水 裕太*

Kumada, Takayuki; Kumagai, Jun*; Ushida, Takahiro*; Shimizu, Yuta*

放射線照射した固体水素及びパラ水素の電子スピン共鳴実験を行い、水素イオンラジカルH$$_{6}$$$$^{+}$$の信号観測に成功した。H$$_{6}$$$$^{+}$$は固体水素中をH$$_{6}$$$$^{+}$$+H$$_{2}$$$$rightarrow$$H$$_{2}$$+H$$_{6}$$$$^{+}$$反応の繰り返しにより拡散し、同位体交換反応H$$_{6}$$$$^{+}$$+HD$$rightarrow$$H$$_{5}$$D$$^{+}$$+H$$_{2}$$、又はH$$_{6}$$$$^{+}$$+D$$_{2}$$$$rightarrow$$ H$$_{4}$$D$$_{2}$$$$^{+}$$+ H$$_{2}$$を持ってその拡散は終結する。生成物の同位体置換体は捕捉電子との対再結合により消滅することがわかった。

We carried out electron spin resonance (ESR) study of irradiated solid para-H$$_{2}$$. H$$_{6}$$$$^{+}$$ lines were observed. The H$$_{6}$$$$^{+}$$ ion is the ionic hydrogen radical whose spectrum is firstly observed in irradiated solid para-H$$_{2}$$. The H$$_{6}$$$$^{+}$$ ions diffuse in solid H$$_{2}$$ via the repetition of H$$_{6}$$$$^{+}$$ + H$$_{2}$$ $$rightarrow$$ H$$_{2}$$ + H$$_{6}$$$$^{+}$$ reaction, which terminate by the isotope-exchange reaction H$$_{6}$$$$^{+}$$ + HD $$rightarrow$$ H$$_{5}$$D$$^{+}$$ + H$$_{2}$$ or H$$_{6}$$$$^{+}$$ + D$$_{2}$$ $$rightarrow$$ H$$_{4}$$D$$_{2}$$$$^{+}$$ + H$$_{2}$$. Unlike H$$_{6}$$$$^{+}$$, the isotope substitutions H$$_{5}$$D$$^{+}$$ and H$$_{4}$$D$$_{2}$$$$^{+}$$ cannot diffuse in solid para-H$$_{2}$$. Rate-determining step of their decay is charge recombination with e$$^{-}$$.

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