2013 Fiscal Year Final Research Report
Dynamical structures of intermolecular vibrational motions related with weak hydrogen bonding by terahertz time-domain spectroscopy
| Project/Area Number |
23750009
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical chemistry
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| Research Institution | University of Fukui |
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Principal Investigator |
YAMAMOTO Kohji 福井大学, 遠赤外領域開発研究センター, 准教授 (70432507)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 分子動力学 / テラヘルツ分光 |
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| Research Abstract |
We investigated weak hydrogen bonding ofDMSO/cyclohexane solution by terahertz time-domain spectroscopy and mid IR absorption spectroscopy. We showed that both of the DMSO monomers and dimers are present in DMSO/cyclohexane solution by the observation of S=O stretching vibrations in the mid-IR region. We also showed the stability of the DMSO dimers formed through weak hydrogen bonding by quantum calculations based on density functional theory. Corresponding to the concentration range of formation of DMSO dimers we observed the broad THz absorption, indicating the intermolecular vibration of the DMSO dimers. We investigated the THz dielectric response of saturated hydrocarbon liquids with branched structures. We observed THz dielectric response dependent on the branching positions and the branched structures. Using MD simulation saturate hydrocarbon with ring-shaped structures shows dielectric broad response originating in underdamped vibrations, corresponding to our results. On the other hand we have failed in reproducing dependence of the dielectric response on the normal alkanes and those with branched structures. This results indicate that considerations of many-body effects are necessary to understand the terahertz dielectric response of saturated hydrocarbon.
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[Journal Article] Photoconductive Emission and Detection of Terahertz Pulsed Radiation Using Semiconductors and Semiconductor Devices2012
Author(s)
Masahiko Tani, Kohji Yamamoto, Elmer S. Estacio, Christopher T. Que, Hidekazu Nakajima, Masakazu Hibi, Fumiaki Miyamaru, Seizi Nishizawa, and Masanori Hangyo
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Journal Title
In a special issue of Journal of Infrared, Millimeter, and Terahertz Waves
Volume: 33(5)
Pages: 393-404
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[Journal Article] Terahertz emission from Indium Oxide films grown on MgO substrates using sub-bandgap photon energy excitation2012
Author(s)
Elmer S. Estacio, Christopher T. Que, Fritz C.B. Awitan, Jan Issac Bugante, Francesca Isabel de Vera, Jonathan Azares, Jessica Afalla, Jeffrey de Vero, Armando S. Somintac, Roland V. Sarmago, Arnel A. Salvador, Kohji Yamamoto, and Masahiko Tani
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Journal Title
Opt. Express
Volume: 20(4)
Pages: 4518-4524
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[Journal Article] Application of Terahertz Absorption Spectroscopy to Evaluation of Aging Variation of Medicine2011
Author(s)
Masaya Kawase, Tadashi Saito, Masafumi Ogawa, Hideki Uejima, Yasutoshi Hatsuda, Sonoyo Kawanishi, Yoshihiko Hirotani, Michiaki Myotoku, Kenji Ikeda, Hiroki Konishi, Ikumi Iga, Junji Yamakawa, Seizi Nishizawa, Kohji Yamamoto, and Masahiko Tani
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Journal Title
Analytical Sciences
Volume: 27(2)
Pages: 209-212
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[Presentation] Terahertz Dielectric Response of Saturated Hydrocarbon2012
Author(s)
Kohji Yamamoto, Kanami Kotani, Daiki Tsunemi, Shogo Hayashi, Hirokatu Itoh, Kazutoshi Fukui, Masahiko Tani
Organizer
Poster No. Pos2.26, International Symposium on Frontiers in Terahertz Technology (FTT 2012)
Place of Presentation
Todaiji Culture Center, Nara, Japan
Year and Date
20121126-30
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[Presentation] Terahertz Time-Domain Spectroscopy of CVD Diamond2012
Author(s)
Kohji Yamamoto, Hironori Iwasaki, Shinsei Tsuji, Ryouhei Yasuda, Kazutoshi Fukui, Masahiko Tani, Takashi Shimozuma, Satoshi Ito, and Teruo Saito
Organizer
Fri-A-1-6, The 37th International Conference on Infrared, Millimeter and Terahertz Waves
Place of Presentation
University of Wollongong, Wollongong, Australia
Year and Date
20120923-28
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[Presentation] Terahertz Superfocusing Using a Metal Tapered Parallel Waveguide and Its Application to Terahertz Time-Domain Spectroscopy of Hollow Plastic Tube2012
Author(s)
Kohji Yamamoto, Hironori Iwasaki, Shinsei Tsuji, Ryouhei Yasuda, Kazutoshi Fukui, Kazuyoshi Kurihara, Fumiyoshi Kuwashima, and Masahiko Tani
Organizer
Mon-Pos-45, The 37th International Conference on Infrared, Millimeter and Terahertz Waves
Place of Presentation
University of Wollongong, Wollongong, Australia
Year and Date
20120923-28
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