One- and two-photon pump-probe optical spectroscopic measurements reveal the S1 and intramolecular charge transfer states are distinct in fucoxanthin
One- and two-photon pump-probe optical spectroscopic measurements reveal the S1 and intramolecular charge transfer states are distinct in fucoxanthin
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DOI：
10.1016/j.cplett.2009.10.077
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发表时间：
2009-11-24
影响因子：
2.8
通讯作者：
Hashimoto, Hideki
中科院分区：
文献类型：
--
作者：
Kosumi, Daisuke;Kusumoto, Toshiyuki;Hashimoto, Hideki
用飞秒色散的单光子和双光子泵浦探测光谱研究了岩藻黄质在极性和非极性溶剂中的超快弛豫动力学。最低单重态S-1(2(1)A(G)(-))态和/或分子内电荷转移(ICT)态激发到光学允许的S-2(1(1)B(U)(+))态后的瞬时吸收动力学强烈依赖于溶剂的极性。在非极性溶剂中，S-1/ICT的直接双光子激发后的瞬时吸收光谱和吸光度变化动力学强烈地依赖于激发能量。结果表明，在极性溶剂中，ICT状态与S-1的状态不同。(C)2009爱思唯尔B.V.保留所有权利。
The ultrafast relaxation kinetics of fucoxanthin in polar and non-polar solvents have been studied by femtosecond dispersed one-and two-photon pump-probe spectroscopies. Transient absorption kinetics of the lowest singlet S-1 (2(1)A(g)(-)) state and/or intramolecular charge transfer (ICT) state after excitation to the optically allowed S-2 (1(1)B(u)(+)) state depend strongly on solvent polarity. Transient absorption spectra and the kinetics of absorbance changes after direct two-photon excitation to S-1/ICT depend strongly on excitation energy in non-polar solvent. The results suggest that the ICT state is a distinct state from S-1 in polar solvent. (C) 2009 Elsevier B.V. All rights reserved.