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

  • Lei Zhang
  • Donghui Quan
  • Li Wang
  • Guozhen Yang
  • Yuxiang Weng
Article
  • 141 Downloads

Abstract

The femtosecond time-resolved difference absorption spectra of all-trans-β-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-β-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.

Keywords

singular value decomposition femtosecond time-resolved spectroscopy all-trans-β-Apo-8′-carotenal 

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Copyright information

© Science in China Press 2004

Authors and Affiliations

  • Lei Zhang
    • 1
  • Donghui Quan
    • 1
  • Li Wang
    • 1
  • Guozhen Yang
    • 1
  • Yuxiang Weng
    • 1
  1. 1.Institute of PhysicsChinese Academy of SciencesBeijingChina

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