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H atom, e$$^{-}$$, and H$$_6^{+}$$ ions produced in irradiated solid hydrogens; An Electron spin resonance study

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

Very recently, we succeeded in observing totally more than 50 sharp ESR lines of H$$_6^{+}$$ and its isotope substituents H$$_{5}$$D$$^{+}$$, H$$_{4}$$D$$_2^{+}$$, and H$$_{2}$$D$$_4^{+}$$ in $$gamma$$-ray irradiated solid para-H$$_{2}$$ (p-H$$_{2}$$) and p-H$$_{2}$$-D$$_{2}$$ and p-H$$_{2}$$-HD mixtures. We also observed isotope-substitution reactions such as H$$_6^{+}$$ + HD $$rightarrow$$ H$$_{5}$$D$$^{+}$$ + H$$_{2}$$ and H$$_6^{+}$$ + D$$_{2}$$ $$rightarrow$$ H$$_{4}$$D$$_2^{+}$$ + H$$_{2}$$. The H$$_6^{+}$$ ions diffuse in solid p-H$$_{2}$$ via the repetition of H$$_6^{+}$$ + H$$_{2}$$ $$rightarrow$$ H$$_{2}$$ + H$$_6^{+}$$ reactions which terminate by the H$$_{6}$$$$^{+}$$ + HD or H$$_6^{+}$$ + D$$_{2}$$ reactions. The H$$_{5}$$D$$^{+}$$, H$$_{4}$$D$$_2^{+}$$, and H$$_{2}$$D$$_4^{+}$$ ions, on the other hand, are immobile in solid p-H$$_{2}$$. They decay via geminate recombination with trapped electrons within the time-scale of 5 hours.

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Category:Chemistry, Physical

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