Zhang J P, Skibsted L H, Fujii R, Koyama Y
Faculty of Science, Kwansei Gakuin University, Uegehera, Nishinomiya 662-8501, Japan.
Photochem Photobiol. 2001 Mar;73(3):219-22. doi: 10.1562/0031-8655(2001)073<0219:taftus>2.0.co;2.
We have attempted subpicosecond time-resolved absorption spectroscopy of all-trans-beta-carotene in organic solvents in the 820-1060 nm region and found novel transient absorption features which lived in subpicosecond time scales. A first component that appeared immediately after excitation showed a lifetime of 190 +/- 10 fs in n-hexane in agreement with the 1Bu+ lifetime that had been determined by fluorescence upconversion spectroscopy (195 +/- 10 fs). (Kandori et al. [1994] J. Am. Chem. Soc. 116, 2671-2672.) Therefore, this component is assigned to a transient absorption from the 1Bu+ state.
我们尝试对有机溶剂中全反式β-胡萝卜素在820 - 1060 nm区域进行亚皮秒时间分辨吸收光谱研究，并发现了存在于亚皮秒时间尺度的新型瞬态吸收特征。激发后立即出现的第一个组分在正己烷中的寿命为190±10飞秒，这与通过荧光上转换光谱法测定的1Bu +寿命（195±10飞秒）一致。（神取等人，[1994]《美国化学会志》116, 2671 - 2672。）因此，该组分被归因于来自1Bu +态的瞬态吸收。
