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Experimental determination of the mechanism of the tunneling diffusion of H atoms in solid hydrogen; Physical exchange versus chemical reaction

固体水素中における水素原子トンネル拡散機構の実験的検証

熊田 高之

Kumada, Takayuki

酸素分子の紫外線乖離により生成した固体水素中の水素原子の再結合反応に対する圧力依存性を電子スピン共鳴法を用いて調べた。4.2K以下で13MPaで再結合速度定数は全く圧力に依存しなかった。この結果は固体水素中における水素原子のトンネル拡散が物理拡散ではなくトンネル反応H+H$$_2$$$$rightarrow$$H$$_2$$+H により進行していることを示す。

Effect of pressure on the recombination of H atoms produced by UV-photolysis of O$$_2$$-doped solid H$$_2$$ was studied using ESR spectroscopy. The recombination rate constant was independent of pressure up to 13 MPa below 4.2 K, whereas it remarkably decreases with the increase in pressure above. The absence of pressure effect indicates that the H atoms do not diffuse by the physical exchange of positions with neighboring H$$_2$$ molecules, but by the tunneling reaction H + H$$_2$$ $$rightarrow$$ H$$_2$$ + H.

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パーセンタイル:19.75

分野:Materials Science, Multidisciplinary

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