• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1995 Fiscal Year Final Research Report Summary

Construction and Application of a Multi-Function Laser Photolysis ESR

Research Project

Project/Area Number 06554032
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物質変換
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

HIROTA Noboru  Kyoto University, Graduate School of Science Professor, 大学院・理学研究科, 教授 (90093301)

Co-Investigator(Kenkyū-buntansha) FUJII Kanae  Nihon Densi K.K., Analytical Instrument Division Chief Engineer, 分析機器, 課長
TERAZIMA Masahide  Kyoto University, Graduate School of Science Associate Professor, 大学院・理学研究所, 助教授 (00188674)
Project Period (FY) 1994 – 1995
KeywordsESR / laser photolysis / CIDEP / transient absorption / time-resolved ESR
Research Abstract

In order to make a multi functional laser photolysis ESR spectrometer by combining an ESR spectrometer with various equipments for spectroscopic measurements the followings were made.
(1) A variable wavelength pulsed-TAG laser system was introduced to perform laser photolysis at various wavelengths in the visible to UV region. (2) An ESR cavity was modified to do simultaneous measurements of CIDEP and laser photlysis. (3) Simultaneous measurements of ESR,reansient absorption and fluorescence were tried using an ESR cavity. (4) The ESR spectrometer was modified to do optical detection of ESR by inducing microwave transitions among spin-sublevels. After checking the performance of the spectrometer system, the follwoing studies were made.
1) Studies of the initial processes of photochemical reactions by ESR and transient absorption : We have made a detailed investigation on the CIDEP of redicals produced by hyrogen abstraction reactions of azaaromatic molecules by 2-propanol. The observed CIDEP signals are strongly dependent on the concentration, the excitation light intensity and the delay time, showing that several different CIDEP mechanisms are involved. It was concluded that the net emissive polarization observed at relatively high concentrations are likely due to the radical-triplet pair mechanism (RTPM). The time profiles of the observed signals were comparaed with the theoretical predictions made on the basis of possible reaction and relaxation schemes. The effect of the T-T annihilation on the CIDEP signal rise was also clarified.
2) CW and FT time-resoved ESR studies of photochemical reactions and CIDEP : Detailed investigations on the quenching rates of various molecules by 2-propanolyl radical and the magnetic field dependence of the triplet mechanisms of CIDEP were made and much new information was obtained.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] K. Ohara, N. Hirota C. A. Steren, H. van Willigen: "CW and FT time-resolved EPR investigation of quenching reaction of the 2-hydroxypropan-2yl radical" Journal of physical Chemistry. 100. 3070-3074 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N. Hirota: "Chemically cuduced dynamic electron polarization studies of photochemical reactions: acetone in 2-propanol and triethylamine" Bulletin of Chemical Society of Japan. 68. 2997-3010 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Ohara, M. Terazima N. Hirota: "CIDEP studies in low-frequency microwave regions, magnetic field dependence of CIDEP" Journal of Physical Chemistry. 99. 17814-17821 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Okamoto, M. Terazima N. Hirota: "Temperature dependence of diffusion of radical intcrmediates probed by the transieut glating method" Journal Chemical Physics. 103. 10445-10452 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Nakamura, M. Terazima N. Hirota, S. Nakajima A. Osuka: "Investigation of spin-correlated ion pairs in destance-fixed triads by time-resolved electron paramagnetic" Bulletin of Chemical Society of Japan. 68. 2193-2202 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Ohara, N. Hirota C. A. Steren, H. van Willigen: "FT-EPR studies of the CIDEP of 2-propanolye radical produced by the reaction of aceton" Chemical physics Letters. 232. 169-175 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 広田 襄: "伊藤公一編“分子磁性"電子スピン分極からみた分子磁性の動的挙動" 学会出版センター, 373-393 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ohara, N.Hirota, C.A.Steren, H.van Willigen: "CW and FT time-resolved EPR investigation of quenching reaction of the 2-hydroxypropan-2-yl radical" J.Physical Chemistry. 100. 3070-3074 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Hirota: "Chemically induced dynamic electron polarization studies of photochemical reactions : acetone in 2-propanol and triethylamine" Bull.Chem.Soc., Japan. 68. 2997-3010 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ohara, M.Terazima, N.Hirota: "CIDEP studies in low-frequency microwave regions, magnetic field dependence of CIDEP" J.Physical Chemistry. 99. 17814-17821 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Okamoto, M.Terazima, N.Hirota: "Temperature dependence of diffusion of radical intermediates probed by the transient grating method." J.Chemical Physics. 103. 10445-10452 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Nkamura, M.Terazima, N.Hirota, S.Nkajima, A.Osuka: "Investigation of spin-correlated ion pairs in distance-fixed triads by time-resolved electron paramagnetic resonance" Bull.Chem.Soc., Japan. 68. 2193-2202 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ohara, N.Hirota, C.A.Steren, H.van Willigen: "FT-FPR studies of the CIDEP of 2-propanolyl radical produced by the reaction of acetone with triethylamine" Chem.Phys.Lett.232. 169-175 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Hirota: "Dynamic behavior of molecular magnetism probed by electron spin polarization, K.Ito, ed. "Molecula magnetism"" Gakkai Syuppan center. 373-393 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1997-03-04  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi