Dephasing dynamics of the vibronic states of epitaxial polydiacetylene films.
Dephasing dynamics of the vibronic states of epitaxial polydiacetylene films.
复制标题
外延聚二乙炔薄膜振动态的相移动力学。
DOI：
10.1103/physrevlett.74.904
复制
发表时间：
1995
影响因子：
8.6
通讯作者：
Bigot
中科院分区：
文献类型：
--
作者：
Pham;Daunois;Merle;Le Moigne J;Bigot
利用飞秒光脉冲，利用光子回波和泵浦探测技术测量了聚二乙炔（pDCH）的振动态动力学。激子失相（52 fs）主要是由激子之间的相互作用和聚合物链的振动模式决定的。与C≡C三键相比，C= C双键的重要性在消相和早期居群动力学中都有所体现。这些结果表明，在激发后，聚二乙炔主链发生了瞬态结构变化，电子态呈丁腈分布。
The dynamics of polydiacetylene (pDCH) vibronic states has been measured with photon echoes and pump probe techniques using femtosecond optical pulses. The excitonic dephasing (52 fs) is shown to be dominated by interactions between excitons and the vibration modes of the polymer chain. The importance of the C= C double bonds compared to the C≡ C triple bonds shows up both in the dephasing and early population dynamics. These results sugest that just after excitation the polydiacetylene backbone undertakes a transient structural change with a butatrieniclike distribution of the electronic states.