Transient absorption study of peridinin and peridinin-chlorophyll a-protein after two-photon excitation
Transient absorption study of peridinin and peridinin-chlorophyll a-protein after two-photon excitation
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DOI：
10.1021/jp031331b
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发表时间：
2004-07-22
影响因子：
3.3
通讯作者：
Fleming, GR
中科院分区：
文献类型：
--
作者：
Linden, PA;Zimmermann, J;Fleming, GR
在甲醇溶液中，用12光子激发的泵浦-探测光谱研究了附着素-叶绿素a-蛋白质复合体(PCP)和附着素分子。我们的数据与早期的双光子荧光激发光谱一致，并得出结论：在甲醇溶液中，Peridinin在强允许的S-0-S-2(B-u(+))带的红边存在一个单独的双光子允许跃迁。在PCP络合物中，1150 nm处的双光子激发也可以解释为准备了一个新的态。在这两种情况下，新的态最有可能是S-1(Ag-)态。目前还不可能从实验上得出结论，Peridinin是具有溶剂相关性质的单一低激发态，还是具有A(G)(-)和电荷转移态的两个截然不同的态。
lTwo-photon excited pump-probe spectroscopy was carried out on the peridinin-chlorophyll a-protein complex (PCP) and on the peridinin molecule in methanol solution. Our data are consistent with earlier two-photon fluorescence excitation spectral(1.2) and lead to the conclusion that, for peridinin in methanol solution, a separate two-photon-allowed transition exists just to the red of the strongly allowed S-0 - S-2(B-u(+)) band. In the PCP complex, two-photon excitation at 1150 nm can also be interpreted as preparing a new state. In both cases, the new state is most likely the S-1(Ag-) state. It is not yet possible to conclude experimentally whether peridinin possesses a single low lying state with solvent dependent properties or two distinct states, the A(g)(-) and the charge transfer states.