The Determination of the Internal Conversion of Carotenoids by Subpicosecond Time-resolved Raman Spectroscopy using Stimulated-Raman Process——the Correlation between the Lifetime and Energy Gap in each Excited State

DOI

Bibliographic Information

Other Title
  • サブピコ秒時間分解誘導ラマンを用いたカロテノイドの内部転換の決定——各励起状態の寿命とエネルギーギャップの関係

Abstract

The internal conversion from 1Bu+ down to 2Ag- facilitates the singlet energy transfer in the channel from 2Ag- state of carotenoid to Qy state of bacteriochlorophyll in antenna complex. In-between 1Bu+ and 2Ag- state, spectroscopy such as resonance-Raman excitation profile found 1Bu-, 3Ag- state in the carotenoids having the conjugated double-bonding number, n = 9-13. This fact implies the sequential internal conversion from 1Bu+ take place through 3Ag-, 1Bu- states.<br> Spheroidene and lycopene were prepared by extraction, twice alumina column, and re-crystallization. They were measured with subpicosecond time-resolved Raman spectroscopy, which accomplished high temporal resolution with the use of two laser pulses for the probing of Raman process. The internal conversion processes of 1Bu+→3Ag-→1Bu-→2Ag- were identified by a key stretching Raman line of each excited state. We are going to perform the singular-value decomposition and global fitting and to determine the lifetime of each excited state.

Journal

Details 詳細情報について

  • CRID
    1390001205629116800
  • NII Article ID
    130006989528
  • DOI
    10.14841/jspp.2006.0.025.0
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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