Femtosecond vibrational study for exploring the transition-state structure

利用泵浦-转储-探测光谱技术，我们研究了在超快反应中起关键作用的锥形交叉区附近反应分子的动力学。数据清楚地表明，转储效率上升较慢，转储与较长的波长，揭示了波包迁移到锥形交叉区域沿着的反应坐标。我们还实现了可调谐紫外脉冲的紫外共振飞秒受激拉曼光谱，并利用这一点，我们揭示了光活性黄色蛋白质的发色团经历了一个快速的面内变形后1 ps。

Using pump-dump-probe spectroscopy, we studied the dynamics of reacting molecules near the conical intersection region that plays crucial roles in ultrafast reactions. The data clearly showed that the dump efficiency rises up more slowly for dumping with longer wavelengths, revealing the wavepacket migration toward the conical intersection region along the reaction coordinate. We also realized uv-resonance femtosecond stimulated Raman spectroscopy with tunable uv pulses, and using this, we revealed that the chromophore of photoactive yellow protein undergoes a rapid in-plane deformation within 1 ps after photoexcitation.