2006 Fiscal Year Final Research Report Summary
Temporal and space resolved detection of laser-induced crystallization process
| Project/Area Number |
16072212
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Osaka University |
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Principal Investigator |
MIYASAKA Hiroshi Osaka University, Graduate School of Engineering Science, Professor (40182000)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Syoji Osaka University, Graduate School of Engineering Science, Assistant Professor (10372632)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Molecular crystal / Photo-switching / Single molecule detection / Mesoscopic systems |
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| Research Abstract |
With a view to elucidating molecular dynamics in the nucleation process of organic crystals in solids, we have studied model systems, pyrene molecules in low temperature glassy matrices of mixture solvent consisting of isopentane and methylcyclohexane. In the series of experiments we demonstrated that irradiating several thousands of nanosecond laser pulses at 355 nm to the model system induced the efficient aggregation of the solute in the solid matrices even at 77 K. During the crystallization induced by successive UV irradiation, an emission peak that could be attributed to the excimer of pyrene increased in intensity with an increase in the shot-number of the UV pulse, while the excimer emission was not detected without laser irradiation. The excimer emission appeared even by single shot irradition of the UV pulse, which indicates that the single shot of the laser pulse enabled pyrene molecules to stick together by translational/rotational diffusion. This can be explained by transient melting of the glassy matrices induced by the laser irradiation. Time-resolved fluorescence measurements from ps to ns region revealed that the solute molecules moved and formed excimer within the time-width of the UV pulse; the excimers were frozen before dissociation because of short duration of the transient melting almost same as that of the UV pulse and longer lifetime of pyrene excimer (〜 100 ns order). This different time-scale between aggregation and dissociation can explain the efficient aggregation of the solute by UV irradiation in this system.
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[Journal Article] Excitation Energy Migration in Self-Assembled Cyclic Zinc(II) Porphyrin Arrays : A Close Mimicry of Natural Light Harvesting System2005
Author(s)
I-W. Hwang, D. M. Ko, T. K. Ahn, D. Kim, F. Ito, Y. Ishibashi, S. R. Khan, Y. Nagasawa, H. Miyasaka, C. Ikeda, R. Takahashi, K. Ogawa, A. Satake, Y. Kobuke
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Journal Title
Chem. Euro. J. 11
Pages: 3753-3761
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Presentation] Conical Intersections, the Singular Points Determining the Quantum Yield of Photochromic Reactions2004
Author(s)
Shinichiro Nakamura, Takao Kobayashi, Akinori Murakami, Yukako Asano, Dominique Guillaumont, Alexander Goldberg, Gabin Treboux, Satoshi Yabushita, Kingo Uchida, Hiroshi Sekiya, Hiroshi Miyasaka, Masahiro Irie
Organizer
4th International Symposium on Photochromism (ISOP)
Place of Presentation
Arcachon, France
Year and Date
20040912-20040915
Description
「研究成果報告書概要(和文)」より
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[Book] “Coherent Nuclear Dynamics Coupled with Electron Transfer Reaction in Porphyrin-Ferrocene Dyads" Ultrafast Phenomena, Vol. 14, pp. 474-478, (2005) Eds., T. Kobayashi, T. Okada, K. Nelson, S. De Silvestry2005
Author(s)
Satoru Nakashima, Minoru Kubo, Masana Otani, Masataka Murakami, Yukihide Ishibashi, Masakazu Yasuda, Yoshio Mori, Hiroshi Miyasaka, Hiroshi Imahori
Publisher
Elsevier, Amsterdam
Description
「研究成果報告書概要(和文)」より
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[Book] “Vibrational and Electronic Coherence Observed in Two-Dimensional Integrated Three- Pulse Photon Echo" Ultrafast Phenomena, Vol. 14, pp. 598-600, (2005) Eds., T. Kobayashi, T. Okada, K. Nelson, S. De Silvestry2005
Author(s)
Yutaka Nagasawa, Mayu Ogasawara, Yukako Nakagawa, Yoshio Mori, Tadashi Okada, Hirohsi Miyasaka
Publisher
Elsevier
Description
「研究成果報告書概要(和文)」より
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[Book] “Assembling nano/bio Materials by Utilizing Focused Laser Beams", Nanophotonics ; Integrating Photochemistry, Optics and Nano/Bio Materials Studies, Chapter 26, (2004) Eds., Hiroshi Masuhara and Satoshi Kawata2004
Author(s)
Syoji Ito, Chie Matsubara, Yoichiro Hosokawa, Keiko Ikeda, Hajime Mori, Hiroshi Masuhara
Total Pages
473
Publisher
Elsevier, Amsterdam
Description
「研究成果報告書概要(和文)」より
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