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FEMTOSECOND VIBRATIONAL RELAXATION OF EXCITED SINGLET STATES IN ORGANIC DYES USING A TEMPORAL INTENSITY CORRELATION TECHNIQUE OF STIMULATED FLUORESCENCES.

Research Project

Project/Area Number 03804022
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 物理学一般
Research InstitutionKAGAWA UNIVERSITY

Principal Investigator

ITOH Hiroshi  KAGAWA UNIVERSITY FACULTY OF EDUCATION ASSOCIATE PROFESSOR, 教育学部, 助教授 (60112249)

Co-Investigator(Kenkyū-buntansha) KAWASE Masaya  KAGAWA UNIVERSITY FACULTY OF EDUCATION ASSOCIATE PROFESSOR, 教育学部, 助教授 (90224782)
NAKANISHI Shunsuke  KAGAWA UNIV. FACULTY OF EDUCATION ASSOCIATE PROFESSOR, 教育学部, 助教授 (30155767)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1991: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsFEMTOSECOND RELAXATION / TEMPORAL CORRELATION / STIMULATED FLUORESCENCE / INCOHERENT LASER / ORGANIC DYE / 蛍光相関 / 蛍光 / 時間相関法 / 一重項 / フェムト秒振動緩和
Research Abstract

We have found striking signals which showed femtosecond modulation (quantum beat) or temporal peak shifts in correlation traces of stimulated fluorescences generated by exciting Cresyl Violet(CV) and Rhodamine 640 (Rh-640) or DODCI solution of high concentration at room temperature with broadband incoherent (bandwidth was 3- 7 nm) nanosecond dye laser. When the laser beam with a duration of 7 ns was divided into two beams with the wave vector k1 and k2, and one beam was variably delayed with respect to the other. The dye was irradiated with the k1 and k2 beams after focussed. Several wavelengths of lasers were employed to excite the dyes between 532 and 594 nm.
We consider that experimental results are due to the diffraction of the stimulated fluorescence from a dynamic grating initially formed by two exciting beams with femtosecond correlation time. The quantum beats are probably related to the femto-second vibrational dynamics in the excited state of the CV. on the other hand, it is thought that the peak shifts of Rh-640 and other dyes are caused by the depth of dynamic grating determined by balance between absorption of the pump beams and effective emission of the stimulated fluorescences from dye molecules. Moreover, the lack of the beats in the Rh-640 and the DODCI can be interpreted by the different displacement and energy gap between the ground- and excited-state potential surfaces for these dyes from those for the CV.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (1 results)

All Other

All Publications (1 results)

  • [Publications] H.ltoh: "Femtosecond Quantum Beats in Stimulated Fluoresceuce fron deuse Dye Sotution" Confereuce on Ultrafast Phenomena Vlll.

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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