The moderation and tunneling reaction of recoil T atoms in solid xenon-hydrogen mixtures at 77K.
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概要
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Recoil T atom reactions were studied in Xe–H<SUB>2</SUB>–D<SUB>2</SUB> mixtures at 77 K. The isotope effect on the T-atom reaction with H<SUB>2</SUB> and D<SUB>2</SUB> (<I>k</I>(T+H<SUB>2</SUB>→HT+H)/<I>k</I>(T+D<SUB>2</SUB>→DT+D)) was measured on the basis of the HT and DT yields. The isotope effect (<I>k</I>(T+H<SUB>2</SUB>)/<I>k</I>(T+D<SUB>2</SUB>)) is 1.1 in the range of hydrogen concentrations of 0.1–1.0 mol%. Since the small isotope effect (1.1)is similar to the isotope effect (1.0) for a hot T-atom reaction in the gas phase, recoil T atoms are not thermalized at these concentrations in solid xenon and form HT and DT by means of hot-atom reactions. At concentrations of hydrogen of less than 0.1 mol%, the recoil T atoms are thermalized before they encounter the solute hydrogen. The isotope effect increases with a decrease in the hydrogen concentration and amounts to 3.1 at a hydrogen concentration of 0.01 mol%. Since a large isotope effect is expected for the tunneling reaction of T atoms, the large isotope effect (3.1) at 0.01 mol% hydrogen was interpreted in terms of the tunneling reaction of thermalized T atoms. The present results in the solid xenon–hydrogen mixtures were compared with those in the gaseous xenon–hydrogen mixtures reported previously. It was concluded that hot T atoms in the solid xenon at 77 K are deactivated much less effectively than in the gas phase and that they migrate long distances with excess kinetic energies.
- 公益社団法人 日本化学会の論文
著者
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Saeki Masakatsu
Department Of Chemistry Japan Atomic Energy Research Institute
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Miyazaki Tetsuo
Department Of Applied Chemistry Graduate School Of Engineering Nagoya University
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Masaki Nobuyuki
Department Of Cardiology Saitama Medical Center Saitama Medical University
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ARATONO Yasuyuki
Department of Chemistry, Japan Atomic Energy Research Institute
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Fueki Kenji
Department of Chemistry Faculty of Science Osaka University
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Masaki Nobuyuki
Department of Chemistry, Japan Atomic Energy Research Institute
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Fujitani Yoshiteru
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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Tachikawa Enzo
Department of Chemistry, Japan Atomic Energy Research Institute
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