2003 Fiscal Year Final Research Report Summary
Infrared-based and Raman-based Observation of Molecular Vibrations towards Physicochemical Analysis of Ionic Liquids
| Project/Area Number |
14340190
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Kanagawa Academy of Science and Technology |
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Principal Investigator |
ONISHI Hiroshi Kanagawa Academy of Science and Technology, Surface Chemistry Laboratory, Researcher, 極限表面反応プロジェクト, 研究員 (20213803)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIBASHI Taka-aki Kanagawa Academy of Science and Technology, Surface Chemistry Laboratory, Researcher, 極限表面反応プロジェクト, 研究員 (70232337)
YAMAKATA Akira Kanagawa Academy of Science and Technology, Surface Chemistry Laboratory, Researcher, 極限表面反応プロジェクト, 研究員 (60321915)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Ionic liquids / Solvents / Green chemistry / Sum-frequency spectroscopy / Fourth-order Raman spectroscopy / Interface / Molecular Structure / Time-domain spectroscopy |
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| Research Abstract |
Two non-linear, time-domain Raman methods have been developed towards physicochemical analysis of ionic liquids.
(1)Interface-specific observation of molecular vibrations was achieved with visible light by a fourth-order optical process. An aqueous solution of oxazine dye interfaced with air was irradiated with 16-fs pluses at 600 nm. A pump pulse excited Raman-active nuclear motions of the dye. A probe pulse interacted with the excited molecules to generate second harmonic light, the intensity of which was oscillated as a function of the pump-probe delay. Fourier-transformation of the oscillation provided a vibrational spectrum of 0 - 1000 cm^<-1> for the dye located at the air-solution interface.
(2)Femtosecond time-resolved photoinduced reflectivity change was measured for the first time on a spincoated dye (cresyl violet) of submonolayer coverage on a fused silica substrate. We found that the sensitivity of the reflection measurement was much higher than that of the absorption measurement for thin monolayers of dye. A prominent beating structure due to vibrational coherence of the dye was observed on the time-resolved reflection signal. A vibrational spectrum of the dye at submonolayer coverage, which corresponded its resonance Raman spectrum, was obtained in the range of 0-800 cm^<-1> by a Fourier transform analysis of the reflection signal.
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