人工模拟捕光天线分子中超快能量转移的瞬态荧光测量

Ultrafast Energy Transfer in Artificial Antenna Molecule Measured by Transient Fluorescence Spectroscopy

利用飞秒时间分辨瞬态荧光光谱仪测量苝四甲酰二亚胺三聚体内的超快荧光淬灭过程．观察到因能量转移而导致的单体荧光的快速衰减，这一过程的时间常数约为0-82ps．

We have reported previously the ultrafast energy transfer process with a time constant of 0.8 ps from a monomeric to a dimeric subunit within a perylenetetracarboxylic diimide trimer, which was derived indirectly from a model fitting into the transient absorption experimental data. Here we present a direct ultrafast fluorescence quenching measurement by employing fs time-resolved transient fluorescence spectroscopy based on noncollinear optical parametric amplification technique. The rapid decay of the monomer＇s emission due to energy transfer was observed directly with a time constant of about 0.82 ps, in good agreement with the previous result.