期刊
JOURNAL OF FLUORESCENCE
卷 15, 期 1, 页码 3-11出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-005-0207-9
关键词
two-photon excitation anisotropy; steady-state fluorescence; transition dipole moments; fluorene derivatives
The steady-state excitation anisotropy spectra of fluorene derivatives were measured in viscous solvents, under the one- and two-photon excitation, over a broad spectral range (UV-Visible). The orientation of their absorption transition moments for the first, S-0 --> S-1, and second, S-0 --> S-2, excited states were determined. It was shown experimentally that a decrease in the angle between S-0 --> S-1 and S-0 --> S-2 transitions corresponded to an increased value of two-photon absorption (2PA) cross section for these molecules. Two-photon excitation anisotropy was nearly constant over the spectral region investigated (in contrast to one-photon excitation anisotropy spectra) and can be roughly explained by a simple model of 2PA based on the single intermediate state approximation. For comparison, the same trend in two-photon excitation anisotropy was observed for Rhodamine B in glycerol.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据