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Studies on Short-Lived Molecular Species by Raman Spectroscopy

Research Project

Project/Area Number 63045007
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionUniversity-to-University Cooperative Research
Research InstitutionThe University of Tokyo

Principal Investigator

TASUMI Mitsuo  The University of Tokyo, Faculty of Science, Professor, 理学部, 教授 (60011540)

Co-Investigator(Kenkyū-buntansha) ATKINSON George  The University of Arizona, Professor, 教授
FURUKAWA Yukio  The University of Tokyo, Faculty of Science, Lecturer, 理学部, 講師 (50156965)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsPicosecond Spectroscopy / Raman Spectroscopy / Carotenoid / Excited State / Relaxation / Photosynthetic Bacteria
Research Abstract

Two lines of research have been pursued, and the following results have been obtained.
(1) Picosecond time-resolved resonance Raman scattering from excited electronic states of carotenoids in vivo and in vitro.
The vibrational spectroscopy and population dynamics of excited singlet (2^1Ag), excited triplet (^3Bu), and the ground (^1Ag) electronic states of carotenoids in chromatophores of Chromatium vinosum (mainly spirilloxanthin and rhodopin) and of the same carotenoids in benzene solutions are examined by picosecond time-resolved resonance Raman scattering. Compariosons of the time-dependent intensities of 2^1Ag and ^1Ag resonance Raman bands from both in vitro and in vivo carotenoids suggest that vibrationally-excited livels in ^1Ag are populated directly by the decay of the 2^1Ag state and that these levels relax into a thermalized distribution in <50 ps. The appearance of asymmetrically broadened ground-state resonance Raman bands supports this conclusion. Formation of the ^3Bu sta … More te is observed for carotenoids in chromatophores, but not for in vitro spirilloxanthin indicating that the ^3Bu state is formed by fission processes originating from the spatial organization of pigments within chromatophores.
(2) Vibrational Relaxation in Carotenoids in Vivo and in Vitro.
The ground-state ^1Ag vibrational relaxation in the population dynamics of carotenoids in pigment-protein complexes of photosynthetic bacteria (in vivo) and of spirilloxanthin in benzene and toluene solutions (in vitro) is quantitatively characterized using picosecond time-resolved anti-Stokes resonance Raman spectroscopy. For in vitro samples, anti-stokes resonance Raman signals reach maxima <approximately equal>10 ps after optical excitation before decaying with a rate of <approximately equal>15 ps to intensities which reflect a thermalized ^1Ag vibrational population. For the in vivo case, the maximum band intensities are found within the cross-correlation time (<approximately equal>8 ps) defined by the 567 nm pump (6 ps FWHM) and 576 nm probe (6 ps FWHM) laser pulses while the decay rate is similar to that of the in vitro samp Less

Report

(1 results)
  • 1990 Final Research Report Summary
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 野口 巧: "Frequencies of the FranckーCondon active a_g C=C stretching mode in the 2^lA_g excited state of carotenoids" Chemical Physics Letters. 175. 163-169 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 秀則: "Vibrationallyーexcited states in carotenoids:Picosecond timeーresolved antiーStokes resonance Raman spectroscopy" Chemical Physics Letters. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 秀則: "Vibrational spectroscopy of excited electronic states in carotenoids in vivo:Picosecond timeーresolved resonance Raman scattering" Biophysical Journal.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 秀則: "Vibrational relaxation in carotenoids in vivo and in vitro:Picosecond timeーresolved antiーStokes resonance Raman spectroscopy" Journal of Physical Chemistry.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takumi Noguchi: "Frequencies of the Franck-Condon active ag C=C stretching mode in the 2^1Ag^- excited state of carotenoids" Chemical Physics Letters. 175. 1990 (163-)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hidenori Hayashi: "Vibrationally-excited states in carotenoids : Picosecond time-resolved anti-Stokes resonance Raman spectroscopy" Chemical Physics Letters. in press. 1991

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hidenori Hayashi: "Vibrational spectroscopy of excited electronic states in carotenoids in vivo : Picosecond time-resolved resonance Raman scattering" Biophysical Journal. submitted.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hidenori Hayashi: "Vibrational relaxation in carotenoids in vivo and in vitro : Picosecond time-resolved anti-Stokes resonance Raman spectroscopy" Journal of Physical Chemistry. submitted.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary

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Published: 1988-04-01   Modified: 2016-04-21  

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