1995 Fiscal Year Final Research Report Summary
New Development of Quantum Tunneling Reaction at Ultralow Temperature
| Project/Area Number |
06453021
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical chemistry
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| Research Institution | Nagoya University |
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Principal Investigator |
MIYAZAKI Tetsuo Nagoya, Univ., School of Eng., Assoc.Prof., 工学部, 助教授 (90023126)
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| Co-Investigator(Kenkyū-buntansha) |
ARATONO Yasuyuki Japan Atomic Energy Research Institute, Advanced Science Research Group, Senior, 先端基礎研究センター, 主任研究員
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| Project Period (FY) |
1994 – 1995
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| Keywords | Tunneling effect / Tunneling reaction / Hydrogen molecule anions / Solid hydrogen / Vitamin C |
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| Research Abstract |
The isotope effect on hydrogen molecule elimination reaction from 2,3-dime-thylbutane cations (h-DMB^+) and 2,3-dimethylbutane-2,3-d_2 cations (d-DMB^+) has been studied at 77 K.The significant isotope effect (k(h-DMB^+)/k(d-DMB^+)=1.7*10^4) on the reaction was explained in terms of a model of the tunneling elimination of a hydrogen molecule from a DMB^+ ion.
A large isotope effect (*20-50) on the reaction between long-lived radicals that are related to DNA mutation and h-vitamin C (or d-vitamin C) has been observed in concentrated protein solution that is a model of cells. The large isotope effect indicates the importance of a tunneling reaction in a biological system.
H_2^- anions has been observed clearly for the first time by use of a high-resolution-ESR spectroscopy in solid hydrogen at 2.4K.The H_2^- anions decay at 4.2 K by tunneling.
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