title: Excited state absorption dynamics in metal cluster polymer [WS4Cu3I(4-bpy)3]n solution.
abstract: The nonlinear absorptive property of a novel metal cluster [WS(4)Cu(3)I(4-bpy)3]n in DMF solution is studied by using an open-aperture Z-scan technique with picosecond and nanosecond laser pulses at the wavelength of 532 nm. The experimental results show that the cluster has strong nonlinear absorption under the 8 ns pulse excitation and a relatively weak nonlinear absorptive property under the picosecond pulse excitation. The picosecond pump-probe response of the metal cluster is similar to that of C60 solution, which implies that the nonlinear mechanisms are the same for the two materials. By using the rate-equation model, the experimental data are theoretically simulated; several optical parameters of the cluster, especially the lifetime of the higher excited singlet state of the cluster, are obtained.
authors.affiliation: School of Physical Science and Technology, Suzhou University, Suzhou 215006, P.R. China.
authors.forename: Junyi
authors.initials: J
authors.lastname: Yang
authors.forename: Jihua
authors.initials: J
authors.lastname: Gu
authors.forename: Yinglin
authors.initials: Y
authors.lastname: Song
authors.forename: Shi
authors.initials: S
authors.lastname: Guang
authors.forename: Yuxiao
authors.initials: Y
authors.lastname: Wang
authors.forename: Wenhua
authors.initials: W
authors.lastname: Zhang
authors.forename: Jianping
authors.initials: J
authors.lastname: Lang