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- W1997776533 abstract "H atoms produced by the γ-ray irradiation of solid para-H2 (p-H2) and solid normal-H2 (n-H2) decay gradually when the irradiated sample is stored at 4.2 K. ortho-H2 (o-H2) molecules at the sites nearest an H atom in solid n-H2 convert to p-H2 molecules by interacting with the H atom. H atoms in solid H2 decay by the process of tunneling diffusion H + p-H2 → p-H2 + H and finally recombine with other H atoms. The rate constants for the tunneling reaction were obtained from the decay rates of H atoms in solid H2 at various concentrations of o-H2. When solid n-H2 is stored for 10 h at 4.2 K after γ-ray irradiation, a number of o-H2 molecules change into p-H2 molecules by a catalytic chain reaction induced by mobile H atoms. The G value of the o-H2 yields from H atoms amounts to 1−2.6 × 104. The rate constant for the tunneling reaction H + p-H2 → p-H2 + H decreases drastically with increasing numbers of o-H2 molecules, which exist as orientational defects in solid p-H2. It was concluded that a very small amount of energy (ca. 2 cal mol-1) affects the tunneling reaction at very low temperatures." @default.
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- W1997776533 date "2000-09-28" @default.
- W1997776533 modified "2023-10-14" @default.
- W1997776533 title "Decay Dynamics of H Atoms in Solid Hydrogen at 4.2 K. Controlling Factor of Tunneling Reaction H + <i>para</i>-H<sub>2</sub> → <i>para</i>-H<sub>2</sub> + H" @default.
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- W1997776533 doi "https://doi.org/10.1021/jp000440c" @default.
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