The separation of overlapping transitions in β-carotene with broadband 2D electronic spectroscopy
The separation of overlapping transitions in β-carotene with broadband 2D electronic spectroscopy
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DOI：
10.1016/j.cplett.2011.10.051
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发表时间：
2012-01-27
影响因子：
2.8
通讯作者：
Fleming, Graham R.
中科院分区：
文献类型：
--
作者：
Calhoun, Tessa R.;Davis, Jeffrey A.;Fleming, Graham R.
宽带二维电子光谱应用于β-胡萝卜素，揭示了新的洞察激发态动力学的类胡萝卜素探索的全部能量范围内，包括在77 K的S-0 -> S-2和S-1 -> S-1 n跃迁。多个信号中观察到的制度与建议的S* 状态和隔离，通过单独的分析rephasing和nonrephasing的贡献。在重定相途径的峰显示动态的线形特征耦合到高能量的振动模式，和模拟与一个简单的模型支持其分配到脉冲受激拉曼散射。一个信号持续超过10 ps的nonrephasing光谱仍在调查中。(C)2011 Elsevier B. V.保留所有权利。
Broadband 2D electronic spectroscopy is applied to beta-carotene, revealing new insight into the excited state dynamics of carotenoids by exploring the full energetic range encompassing the S-0 -> S-2 and S-1 -> S-1n transitions at 77 K. Multiple signals are observed in the regime associated with the proposed S* state and isolated through separate analysis of rephasing and nonrephasing contributions. Peaks in rephasing pathways display dynamic lineshapes characteristic of coupling to high energy vibrational modes, and simulation with a simple model supports their assignment to impulsive stimulated Raman scattering. A signal persisting beyond 10 ps in the nonrephasing spectra is still under investigation. (C) 2011 Elsevier B.V. All rights reserved.