title: Ultrafast excited-state dynamics associated with the photoisomerization of a cyanine dye.
abstract: The ultrafast excited-state dynamics of a cyanine dye, 3,3'-bis(3-sulfopropyl)-5,5'-dimethoxy-thiacyanine triethylaminium salt, was investigated by using conventional time-resolved fluorescence up-conversion technique. The fluorescence decay can be well described as tri-exponential kinetics, which indicates the excited-state population decays through the bond-twist, vibrational and radiative relaxation channels. Further analysis shows that the contributions of the three relaxation channels to the fluorescence decay demonstrate very different change with increasing the fluorescence wavelength, through which the detailed dynamics at different regions in the excited-state potential energy surface can be retrieved.
authors.affiliation: Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China. zwwang@nudt.edu.cn
authors.forename: Zhenwei
authors.initials: Z
authors.lastname: Wang
authors.forename: Saisai
authors.initials: S
authors.lastname: Chu
authors.forename: Shufeng
authors.initials: S
authors.lastname: Wang
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong
mesh_terms: D002232:Carbocyanines / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D007536:Isomerism; D007700:Kinetics; D055668:Photochemical Processes; D013050:Spectrometry, Fluorescence
chemical_list: D002232:Carbocyanines; D005456:Fluorescent Dyes