Excited state structural dynamics of the charge transfer state of peridinin
Excited state structural dynamics of the charge transfer state of peridinin
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DOI：
10.1560/ijc.47.1.17
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发表时间：
2007-01-01
影响因子：
3.2
通讯作者：
Fleming, Graham R.
中科院分区：
文献类型：
--
作者：
Van Tassle, Aaron J.;Prantil, Matthew A.;Fleming, Graham R.
我们提出了红外和可见光的瞬态吸收测量的第一激发单重态（S-1和S-1/ICT）的多甲藻素在甲醇，异丙醇和氯仿溶液中的单光子激发后，使用490 nm的光，激发S-2状态，通过快速（类似于50 fs的甲醇）内转换填充S-1。这种技术使随后的结构动力学的研究在S中，参与形成的电荷转移状态。的S，在甲醇，异丙醇和氯仿中的多甲藻素的寿命被发现是12，54，和65 ps，分别由红外瞬态吸收测定。我们观察到两个形成时间尺度的S-1状态。我们将最短的时间尺度归因于内部转换后的弛豫，而将较长的时间尺度归因于S-1/ICT状态的形成。
We present infrared and visible transient absorption measurements of the first excited singlet state (S-1 and S-1/ICT) of peridinin in methanol, isopropanol, and chloroform solution following one-photon excitation, using 490 nm light, to excite the S-2 state that populates S-1 via rapid (similar to 50 fs in methanol) internal conversion. This technique enables the study of subsequent structural dynamics in S, involved in the formation of the charge transfer state. The S, lifetime of peridinin in methanol, isopropanol, and chloroform is found to be 12, 54, and 65 ps, respectively, as determined by infrared transient absorption. We observe two formation timescales in the S-1 state. We attribute the shortest timescale to relaxation following internal conversion and the longer timescale to formation of the S-1/ICT state.