| Project/Area Number |
59430002
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理化学一般
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| Research Institution | The Institute of Physical and Chemical Research |
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Principal Investigator |
HAYASHI Hisaharu The Institute of Physical and Chemical Research, その他, 研究員 (50087508)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Haruo The Institute of Physical and Chemical Research, 理論有機化学研究室, 研究員 (80142917)
SAKAGUCHI Yoshio The Institute of Physical and Chemical Reserach, 理論有機化学研究室, 研究員 (30167423)
NAKAMURA Junko The Institute of Physical and Chemical Research, 理論有機化学研究室, 研究員 (30087506)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥21,800,000 (Direct Cost: ¥21,800,000)
Fiscal Year 1986: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1985: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1984: ¥14,500,000 (Direct Cost: ¥14,500,000)
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| Keywords | magnetic field effect / radical pair / carbon disulfide / transient absorption / fluorescence / combustion reaction / picosecond laser / CIDEP / 励起分子 / 外部磁場効果 / ミセル / カルボニル / キサントン / シクロヘキサジエニル型ラジカル / 一酸化窒素 / 化学発光 / レーザー励起けい光 / ピリミジン / 回転緩和 |
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| Research Abstract |
The first purpose of the present project is to clarify some unresolved Problems in the studies of the magnetic field effects on dynamic behavior of excited molecules. The second one is to find new magnetic field effects in order to extend applicability of the effect.
For the first purpose, we studied the mechanism of the magnetic field and magnetic isotope effects on the recombination rates of radical pairs in micelles with the aids of transient absorption and CIDEP techniques. From the observed decay rates of the CIDEP signals and the internal magnetic field effects of lanthanoid ions, the relaxation mechanism was shown to be applicable to the above-mentioned effects. The mechanism of the magnetic quenching of the fluorescence of gaseous <CS_2> was also studied with nanosecond and picosecond dye lasers. From the observed magnetic field effects on the fluorescence excitation spectra and fluorescence decay curves, some intra-molecular relaxation processes were found to be the origin of the magnetic quenching.
For the second purpose, we investigated magnetic field effects in the reactions of hetero-organic radicals having heavier atoms than F and found the effect in a reaction of an S-centerd radical. Furthermore, we constructed an apparatus for studying the magnetic field effects on combustion reactions in low-pressure gasses and found various magnetic field effects on the formation processes of the B state of NO and the A states of OH and CH.
We have also obtained some unexpected results: (1) formation of cyclo-hexadinenyl type and benzyl type radicals in photoreduction of carbonyls and (2) alternating phase effects in some CIDEP spectra observed in micelles. These results attracted international attention.
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