| Project/Area Number |
16340145
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
WATANABE Naoki Hokkaido University, Institute of Low Temperature Science, Assistant Professor, 低温科学研究所, 助手 (50271531)
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| Co-Investigator(Kenkyū-buntansha) |
KOUCHI Akira Hokkaido University, Institute of Low Temperature Science, Professor, 低温科学研究所, 教授 (60161866)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 2005: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | surface reaction of atoms / low temperature reaction / deuterium fractionation |
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| Research Abstract |
This project was carried out for the purpose of obtaining the reaction channels and rates of the formation of interstellar molecules via surface reactions of atoms and also revealing the origin of deuterium enrichment in methanol molecules observed. We summarize the results of our research as follows.
1.The rate of addition of deuterium atoms to solid CO molecule is as slow as one-tenths of that of hydrogen addition, indicating that the deuterium addition is unlikely for the first step of the deuterium enrichment of methanol.
2.We confirmed that H-D substitution reactions in CH_3OH-d_n(CH_3OH-d_n+D→CH_3OH-d_<n+1>,n=0-2) proceed in solid phase at 〜10K. The reaction rates of the substitution decrease as number of D atoms in methanol, n, increases
3.We demonstrated for the first time that deuterium enrichment observed can be achieved partly by the grain-surface reactions. Our quantitative data shows that H-D substitution is more efficient to produce deuterated methanol than the successive deuterium addition to CO in a molecular cloud.
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