Femtosecond time-resolved difference absorption spectroscopy of all-trans-β-Apo-8′-carotenal

作     者：ZHANG Lei QUAN Donghui WANG Li YANG Guozhen WENG Yuxiang 

作者机构：Institute of Physics Chinese Academy of Sciences Beijing 100080 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2004年第47卷第2期

页      面：208-222页

核心收录：

学科分类：07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Acknowledgments We thank Prof.Zhang Jianping for his help and discussion in SVD and global fitting. This work was supported by the Chinese National "Hundreds Talents Program" and the National Key Basic Research and Development Plan under Grant No.(G1998010102) 

主　　题：singular value decomposition, femtosecond time-resolved spectroscopy, ail-trans-β- Apo-8′-carotenal. 

摘      要：The femtosecond time-resolved difference absorption spectra of all-trans-b- Apo-8′-carotenal have been recorded and analyzed by the singular-value decomposition (SVD) method followed by global fitting using a sequential model for the excited-state energy relaxation. With this model, we have obtained the excited-state absorption spectra and the lifetimes of the corresponding excited states both in nonpolar solvent n-hexane and polar solvent methanol. Three excited states, namely S3(170fs), S2(2.32ps) and S1(26ps) in n-hexane, and two excited states S2 (190fs) and S1(9.4ps) in methanol have been observed. The excited-state absorption spectra of all-trans-b-Apo-8′-carotenal in methanol display a red shift and broadeness, while the lifetime of S1 state becomes shorter. It is proposed that these effects are related to the presence of a carbonyl functional group that leads to the solvent effect on the excited-state energy level. At the same time, it is shown that the SVD method is a useful tool in resolving the time-resolved absorption spectra.