| Project/Area Number |
09640600
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
FUJIMURA Yo Kyoto University, Chemistry, Research Associate, 大学院・理学研究科, 助手 (00222266)
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| Co-Investigator(Kenkyū-buntansha) |
KAJIMOTO Okitsugu Kyoto University, Chemistry, Professor, 大学院・理学研究科, 教授 (30029483)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Oxygen / Nitrous Oxide / Hydrogen / Hydrocarbon / Water / Reaction Dynamics / Doppler Spectroscopy / Differential Cross Sections |
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| Research Abstract |
Chemical reaction dynamics of elementary gas phase reactions have been studied via Dopplerresolved polarization spectroscopy. By using this technique, differential cross sections can be measured state-resolved manner. Furthermore, this method enables us to measure the polarization of the rotational angular momentum of reaction products.
Collision-free diatomic product molecules were probed with high-resolution dye laser excitation and its Doppler-broadened line profiles were analyzed to extract the information of vector properties such as differential cross sections and rotational angular momentum polarization, We investigated the reaction of O(^1D) atom with some several simple molecules. Following results are shown. 1) For H_2 reaction, differential cross sections and collision energy dependence of reaction probability strongly depend on ro-vibrational states of product OH molecules. Critical comparison with a quasi-classical trajectory calculation on a recent state-of-the-art ab init
… More
io potential energy surfaces. 2) For N_2O reaction, efficient energy randomization within all the degrees of freedom of reaction intermediates leads apparent statistical ro-vibrational state distribution of product NO molecules despite the absence of a deep potential well. Such a behavior is generally interpreted in terms of intermolecular vibrational-energy redistribution, with the emphasis of the light (hydrogen) atom effect. 3) For C_2H_4 and C_2H_6 reaction, the difference of the structural change of reactive intermediates after the insertion of 0 atom forming alcohol type intermediates is reflected in the difference of the polarization of rotational angular momentum of product OH molecules. 4) For H_2O reaction, the main reaction path is an insertion of O atom into HO bond of H_2O forming HOGH as an intermediate.
To obtain such findings becomes possible only by the use of the state-resolved polarized Doppler spectroscopy. In addition, some of the findings in this study give new understandings which are opposite to the previous ones based on insufficient state-resolved measurements. The study elucidating elementary bimolecular reactions in this manner is essential for the fundamental understanding of chemical reaction dynamics. Less
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