Torsional Motion of the Chromophore Catechol following the Absorption of Ultraviolet Light.
Torsional Motion of the Chromophore Catechol following the Absorption of Ultraviolet Light.
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DOI：
10.1103/physrevlett.114.233001
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发表时间：
2015-06
影响因子：
8.6
通讯作者：
J. Young;M. Staniforth;M. Paterson;V. Stavros
中科院分区：
文献类型：
--
作者：
J. Young;M. Staniforth;M. Paterson;V. Stavros
探测吸收紫外光后分子中能量流的能力，对于揭示光物理现象至关重要。在此，我们在儿茶酚的第一激发态（S1）中激发振动态的相干叠加，从而产生振动波包。观察到的量子拍，分配给低频，强混合，O-H扭转模τ2的叠加，很好地展示了从S1态到阳离子基态（D0）光电离时几何形状的变化如何使人们能够在生物发色团光激发的早期阶段探测能量流。
The ability to probe energy flow in molecules, following the absorption of ultraviolet light, is crucial to unraveling photophysical phenomena. Here we excite a coherent superposition of vibrational states in the first excited electronic state (S1) in catechol, resulting in a vibrational wave packet. The observed quantum beats, assigned to superpositions of the low-frequency, and strongly mixed, O-H torsional mode τ2, elegantly demonstrate how changes in geometry upon photoionization from the S1 state to the ground state of the cation (D0) enables one to probe energy flow at the very early stages of photoexcitation in this biological chromophore.