| Project/Area Number |
17550004
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Tohoku University |
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Principal Investigator |
YAMAKITA Yoshihiro Tohoku University, Graduate School of Science, Research Associate, 大学院理学研究科, 助手 (30272008)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | chemical physics / collisions / atomic ＆ molecular physics / cold molecules / tunneling / cold beam / Stark effect / Rydberg states |
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| Research Abstract |
1. Translational control of molecules
In this research project the investigators have demonstrated by calculations that molecules in a cold beam can be decelerated to standstill at 13 mK using a Stark decelerator which applies time-varying electric fields. The results have been presented in the 7th Asian International Seminar on Atomic and Molecular Physics (Chennai, India) as an invited talk, and the proceeding paper is now under referee processes.
2. Phonon dispersion curves of nanosize carbon networks
Deceleration and translational cooling of molecules could make a significant impact on research area studying collisions of the molecules in the beam and surfaces. In this respect the investigators has established the phonon dispersion curves of polyacenes, which can act as a model for those of highly oriented pyrolytic graphite (HOPG) in surface scattering experiments. The paper has been published in the Journal of Chemical Physics, enabling readers in material sciences to understand. Those for multirow carbon nanoribbons have also been elucidated, and will be published to a good shortly. The point is that the results are based on the rigorous spectroscopic knowledge on polycyclic aromatic hydrocarbons.
3. Orientation control of molecules
The Raman intensity reflects the induced polarizability in molecules. Large Raman scattering activities have been found for substituted benzene analogues upon global motion. The ring-chain interactions involving σ-π orbital mixing have been calculated to play a key role. When halogen atoms or the bridge structures of two rings are introduced, the Raman intensity have been calculated to be significantly large. This fact supports the above mechanism strongly.
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