| Project/Area Number |
08404041
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Tokyo Metropolitan University |
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Principal Investigator |
ACHIBA Yohji TOKYO METROPOLITAN UNIVERSITY Graduate School of Science, Professor, 大学院・理学研究科, 教授 (20002173)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Shinzo TOKYO METROPOLITAN UNIVERSITY Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (10226516)
SHIROMARU Haruo TOKYO METROPOLITAN UNIVERSITY Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (70196632)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥32,700,000 (Direct Cost: ¥32,700,000)
Fiscal Year 1997: ¥12,300,000 (Direct Cost: ¥12,300,000)
Fiscal Year 1996: ¥20,400,000 (Direct Cost: ¥20,400,000)
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| Keywords | Highen Fullerene / Metal encapsulates Fullerene / Single-Wall Carbon Nonotube / Formation Mechanism / Network |
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| Research Abstract |
Supported by the grant-in-aid (A)(2), the following research results have been obtained. (1)In the laser furnace apparatus, when the graphite rod was vaporized for making fullerenes, the intense emission from the carbon particles could be seen. When the image of this emission was taken as a function of the delay after the timing of the laser vaporization of the graphite rod, by use of a high speed video camera (time resolution : 25 micro second), it was found that C_2 emission was dominant in the early stage, while in the later stage, the black body emission was found to be the dominant process, from which the internal temperature of the carbon particles was etimated. A systematic study of this emssion taken under several vaporization conditions has indicated that when the yield of the fullerenes was high, the lifetime of the emission from the carbon particles seemed to be longer. (2)using REMPED spectroscopy technique, the electronically excited state of the odd-numbered carbon cluster negative ion C_n^- (n=7,9,11) has been investigated. (3)Using a laser furnace apparatus, the formation mechanism of the endohedral fullerenes has been investigated. It has been found that the relative atomic ratio and the ambient temperature inside the electric furnace were the key parameters for increasing the yield of endohedral fullerenes. (4)Photoelectron spectroscopy combined with the laser vaporization technique indicated that when the laser vaporization condition has been varied, the ratio between the conformational isomers (of the linear form and of the ring form) has been drastically changed.
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