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Transient Absorption of the Chlorophyll a in Ethanol
Ying Shi1, Y. J. Shiu2, Charlene Su2, S. H. Lin2,3, Ke-li Han*1
1.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;2.Institute of Atomic and Molecular Sciences, Academia Sinica,Taipei;3.Department of Chemistry, National Taiwan University, Taipei
Abstract:
The excited state of Chlorophyll a is investigated by femtosecond transient absorption. The transient absorption spectra of Q band and By band of Chlorophyll a in ethanol have been observed. The fast kinetics of Chlorophyll a which exhibit two ultrafast components were also measured. The one is assigned to transient absorption of the inhomogeneously broadened ground state absorption spectrum, while the other is the response of the solvent to the change of the electron configuration in the excited state due to salvation dynamics of the polar solvent molecules. To understand the anisotropy of Chlorophyll a in ethanol, the anisotropy profile was also performed by 405 nm excitation and found that the anisotropy profile is 0.143. The possible combination of θda, θdb and η at excitation of By band has been simulated.
Key words:  Femtosecond, Chlorophyll a, Transient absorption
FundProject:
叶绿素a分子在乙醇溶剂中的瞬态吸收研究
石英1, 许瑛珍2, 苏夏琳2, 林圣贤2,3, 韩克利* 1
1.中国科学院大连化学物理研究所,分子反应动力学国家重点实验室,大连,116023;2.中央研究院原子分子研究所,台北;3.国立台湾大学化学系,台北
摘要:
采用飞秒瞬态吸收方法研究叶绿素a分子在乙醇溶液的的激发态性质.观测到叶绿素a的Q带和By带的瞬态吸收谱.并且观测到了叶绿素a分子的两个超快动力学过程.认为一个来源于基态吸收谱的非均匀展宽,而另一个则来源于溶剂对于激发态分子结构变化的响应.同时,为了了解叶绿素a在乙醇溶剂中的各相异性,采用405nm激发叶绿素a分子得到了各相异性值为0.143,并通过模拟得到可能的θda、θdb和η
关键词:  飞秒  叶绿素a  瞬态吸收
DOI:10.1360/cjcp2006.19(1).6.5
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