CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan.
Chem Asian J. 2011 Nov 4;6(11):3028-34. doi: 10.1002/asia.201100458. Epub 2011 Oct 13.
The ultrafast dynamics of CS(2) in the (1)B(2)((1)Σ(u)(+)) state was studied by photoelectron imaging with a time resolution of 22 fs. The photoelectron signal intensity exhibited clear vibrational quantum beats due to wave packet motion. The signal intensity decayed with a lifetime of about 400 fs. This decay was preceded by a lag of around 30 fs, which was considered to correspond to the time for a vibrational wave packet to propagate from the Franck-Condon region to the region where predissociation occurred. The photoelectron angular distribution remained constant when the pump-probe delay time was varied. Consequently, variation of the electronic character caused by the vibrational wave packet motion was not identified within the accuracy of our measurements.
采用时间分辨率为 22 fs 的光电子成像技术研究了 CS(2)在 (1)B(2)((1)Σ(u)(+)) 态中的超快动力学。由于波包运动，光电子信号强度表现出明显的振动量子拍。信号强度随时间衰减，寿命约为 400 fs。在此之前，存在大约 30 fs 的滞后，这被认为对应于振动波包从 Franck-Condon 区域传播到预解离发生的区域所需的时间。当泵浦-探测延迟时间变化时，光电子角分布保持不变。因此，在我们测量的精度范围内，没有识别出由振动波包运动引起的电子特性变化。
