高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (3): 373.

• 论文 • 上一篇    下一篇

叶绿素a的光声光谱及弛豫过程

苏庆德, 王勤, 杨跃涛, 赵贵文   

  1. 中国科学技术大学应用化学系, 合肥 230026
  • 收稿日期:1995-03-17 出版日期:1996-03-24 发布日期:1996-03-24
  • 通讯作者: 苏庆德,男,48岁,博士,副教授.
  • 作者简介:苏庆德,男,48岁,博士,副教授.
  • 基金资助:

    国家自然科学基金

The PAS and Relaxation Process of Chlorophyll a

SU Qing-De, WANG Qin, YANG Yue-Tao, ZHAO Gui-Wen   

  1. Department of Applied Chemistry, Uniuersity of Science and Technology of China, Hefei 230026
  • Received:1995-03-17 Online:1996-03-24 Published:1996-03-24

摘要: 采用光声强度谱和位相谱研究了叶绿素a分子的内部能级和弛豫过程。结果表明,叶绿素a分子在两个主要吸收带430nm和660nm处受激后返回基态的途径不同,其中660nm处的弛豫过程与三重态有关。据此导出了两种弛豫过程的定态速率方程。并利用光声光谱和吸收谱的相对峰值比,得出叶绿素a分子的荧光量子效率Q=0.24.

关键词: 光声光谱, 叶绿素a, 弛豫过程

Abstract: The photoacoustic(PA)spectrum in amplitude and phase of chlorophyll a(chl a)has been used to study the energy level and relaxation processes(see Fig.1).At the two main absorption bands S1 and S2 of chl.a, the phase angles are 6.5°and 0°,which indicate that the relaxation processes of excited states are different:the S1 band relaxation undergoes the lowest triplet state(T0) while the S2 band relaxation does not.According to the relaxation processes,a model and corresponding rate equations have been established (see Fig.2).The absorption spectrum of chl.a compared with the PAspectrum has also been reported(see Fig.3),and the fluorescence quantum yield (Q) has been deduced from the intensity ratio of absorption and PAsignal.The result Q=0.24 is obtained which is consistent with the original references,It is proved that the PAspectroscopy is a promising and convenient analytical technique in the energy levels and relaxation studies of biological substances.

Key words: PAS, Chlorophyll a, Relaxation process

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