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Development of molecular spectroscopy with the use of femtosecond light pulses in the near-infrared spectral region

Research Project

Project/Area Number 15350005
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical chemistry
Research InstitutionThe University of Tokyo

Principal Investigator

IWATA Koichi  The University of Tokyo, School of Science, Associate Professor, 大学院・理学系研究, 助教授 (90232678)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥15,400,000 (Direct Cost: ¥15,400,000)
Fiscal Year 2004: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2003: ¥11,000,000 (Direct Cost: ¥11,000,000)
Keywordsfemtosecond / time-resolved / near-infrared spectroscopy / electron-transfer reaction / bianthryl / titanium oxide / 偏光測定
Research Abstract

1. Formation of charge-transfer state in bianthryl
Bianthryl is formed by two anthracene rings connected by a C-C bond. When this molecule absorbs a photon, an electron is migrated from one of the anthracene rings to the other. This is one of the most basic and simplest chemical reactions. By using femtosecond time-resolved near-infrared spectroscopy, the locally excited (LE) state and the charge transfer (CT) state are clearly observed as separate transitions. It has been concluded that the LE state generated by the photoirradiation of bianthryl in acetonitrile solution is directly converted to the CT state.
2.Carrier dynamics in titanium oxide
Because the wavelength of the probe light is longer than visible or ultraviolet spectroscopies, it is possible to apply time-resolved near-infrared spectroscopy to scattering samples with the transmission method. By using this advantage, the head investigator and his collaborators have applied femtosecond time-resolved near-infrared spectroscopy t … More o the powder samples of titanium oxide photocatalyst (TIO4, 20 nm in diameter). They successfully observed an electron relaxation process that occurs within 1 ps, electro-hole recombination processes in several tens of picoseconds, and an electron migration process from titanium oxide to platinum co-catalyst in 2 ps. The results explain the mechanism of the increase of catalytic activities when platinum co-catalyst is loaded to titanium oxide particles.
3.Nature of charge-transfer state of symmetrically and asymmetrically substituted bianthryls
Time-resolved near-infrared spectra of symmetrically and asymmetrically substituted bianthryls have been measured. CT state absorption bands in the near-infrared region were observed only for the symmetrically substituted bianthryls ; they were not observed for the asymmetrically substituted bianthryls. It is strongly suggested that the CT absorption band observed in the near-infrared region represents the charge resonance interaction between the two anthracene rings. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (8 results)

All 2006 2005 2004

All Journal Article (8 results)

  • [Journal Article] Change Resonance Character in Charge Transfer State of Bianthryls : Effect of Symmetry Breaking on Time-Resolved Near-IR Absorption Spectra2006

    • Author(s)
      T.Takaya, S.Saha, H.Hamaguchi, M.Sarkar, A.Samanta, K.Iwata
    • Journal Title

      Lournal of Physical Chemistry A (Letter) 110(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Charge Resonance Character in Charge Transfer State of Bianthryls : Effect of Symmetry Breaking on Time-Resolved Near-IR Absorption Spectra2006

    • Author(s)
      T.Takaya, S.Saha, H.Hamaguchi, M.Sarkar, A.Samanta, K.Iwata
    • Journal Title

      Journal of Physical Chemistry A (Letter) 110 (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Solvent-dependent intra- and intermolecular vibrational energy transfer of W(CO)_6 probed with sub-picosecond time-resolved infrared spectroscopy2005

    • Author(s)
      M.Bannno, S.Sato, K.Iwata, H.Hamaguchi
    • Journal Title

      Chemical Physics Letters 412

      Pages: 464-469

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Carrier dynamics in TiO_2 poeders observed by femtoscecond time-resolved near-infrared spectroscopy at spectral region of 0.9 to 1.5 μm with direct absorption method2004

    • Author(s)
      K.Iwata, T.Takaya, H.Hamaguchi, A.Yamakata, T.Ishibashi, O.Onishi, H.Kuroda
    • Journal Title

      Journal of Physical Chemistry B 105

      Pages: 20233-20239

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Femtosecond electron transfer dynamics of 9,9'-bianthryl in acetonitrile as studied by time-resolved near-infrared absorption spectroscopy2004

    • Author(s)
      Tomohisa Takaya, Hiro-o Hamaguchi, Haruo Kuroda, Koichi Iwata
    • Journal Title

      Chemical Physics Letters 399

      Pages: 210-214

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Carrier dynamics in TiO_2 and Pt/TiO_2 powders observed by femtosecond time-resolved near-infrared spectroscopy at spectral region of 0.9 to 1.5 μm with direct absorption method2004

    • Author(s)
      K.Iwata, T.Takaya, H.Hamaguchi, A.Yamakata, T.Ishibashi, H.Onishi, H.Kuroda
    • Journal Title

      Journal of Physical Chemistry B 108

      Pages: 20233-20239

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Carrier dynamics in TiO_2 and Pt/TiO_2 powders observed by femtosecond time-resolved near-infrared spectroscopy at spectral region of 0.9 to 1.5 μm with direct absorption method2004

    • Author(s)
      K.Iwata, T.Takaya, H.Hamaguchi, A.Yamakata, T.Ishibashi, H.Onishi, H.Kuroda
    • Journal Title

      Journal of Physical Chemistry B 108・52

      Pages: 20233-20239

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Femtosecond electron transfer dynamics of 9,9'-bianthryl in acetonitrile as studied by time-resolved near-infrared absorption spectroscopy2004

    • Author(s)
      Tomohisa Takaya, Hiro-o Hamaguchi, Haruo Kuroda, Koichi Iwata
    • Journal Title

      Chemical Physics Letters 399・1-3

      Pages: 210-214

    • Related Report
      2004 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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