1999 Fiscal Year Final Research Report Summary
Fundamental processes of tunneling reaction
| Project/Area Number |
08240105
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Research Institution | Nagoya University |
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Principal Investigator |
MIYAZAKI Tetsuo Nagoya Univ., School of Eng., Prof., 工学研究科, 教授 (90023126)
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| Co-Investigator(Kenkyū-buntansha) |
ARATONO Yasuyuki Japan Atomic Energy Res. Inst., Senior Researcher, 先端基礎研究センター, 主任研究員
NAKAMURA Hiroki Inst. Molecular Science, Prof., 分子科学研究所, 教授 (10010935)
SHIOTANI Masaru Hiroshima Univ., School of Eng., Prof., 工学部, 教授 (80002137)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Tunneling reaction / Solid hydrogen / Tunneling displacement / Quantum effects / Nonadiabatic transition / Chemical reaction dynamics / Tritium / Reaction in cells |
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| Research Abstract |
The detailed mechanism of a tunneling reaction has not been studied previously. Here the several factors that control a tunneling reaction have been elucidated at ultralow temperature. The selective reaction caused by tunneling is presented in solid hydrocarbon. It is also shown that a tunneling reaction of vitamin C and long-1ived radicals in γ-irradiated cells is related to suppression of cancer.
The temperature dependent ESR spectra of partially deuteriated cyclohexane radical cations were successfully analyzed in terms of dynamical averaging due to a tunneling displacement among the Jahn-Teller distorted C2h structures with different zero-point vibration energies. Furthermore, quantum effects of nuclear spin-rotation coupling were demonstrated for selectively deuteriated methyl radicals in low temperature argon matrix.
Hydrogen atom transfer chemical reactions have been successfully conceptualized as vibrationally nonadiabatic transitions in the vicinity of potential ridge. New control scheme of molecular processes by time-dependent external fields has been proposed.
Tunneling abstraction reaction of tritium(T), which is the heaviest hydrogen isotope, with isotopic hydrogen molecules was observed for the first time. It was proposed that the recombination of T and H proceeds through their bubble states in the liquid helium, which is the typical quantum liquid.
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