2012 Fiscal Year Final Research Report
Enhancement and control of coherence by degenerate-four-wave-mixing
| Project/Area Number |
23655011
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
NAGASAWA Yutaka 大阪大学, 大学院・基礎工学研究科, 准教授 (50294161)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 超高速分光 / フェムト秒レーザー分光 / 縮退四光波混合 / コヒーレント制御 / 核波束運動 / コヒーレント分子振動 / 電荷移動反応 / 電子移動反応 |
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| Research Abstract |
To accelerate the degenerate four-wave-mixing (DFWM) measurement, rapid scanning stage was introduced to the experimental setup and the signal was monitored by an oscilloscope.With this system, integration of 500 times takes only 2 minutes and the acceleration of the measurement was successful. Ultrafast DFWM measurement (pulse duration: ca. 13 fs) of oxazine 1 (Ox1) in electron donating solvent, N,N-dimethylaniline (DMA), was carried out and compared with that in an inert solvent, 1-chloronaphthalene (1-CN). In 1-CN, strong oscillation due to the coherent nuclear wavepacket motion was observed. On the other hand, in DMA, ultrafast decay within 100 fs, which is due to the charge transfer (CT) reaction, was observed and the oscillation also dephased very rapidly. By comparing the Fourier transform spectra of the signals, it was concluded that wavepacket motion in the CT state could be appearing for Ox1 in DMA.
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[Journal Article] One-Color Reversible Control of Photochromic Reactions in a Diarylethene Derivative: Three-photon Cyclization and Two-Photon Cycloreversion by Near IR Femtosecond Laser Pulse at 1.28 μm.2011
Author(s)
K. Mori, Y. Ishibashi, H. Matsuda, S.Ito, Y. Nagasawa, H. Nakagawa, K. Uchida, S. Yokojima, S. Nakamura, M. Irie, and H.Miyasaka
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Journal Title
J. Am. Chem. Soc.
Volume: 133[8]
Pages: 2621-2625
Peer Reviewed
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