Excited state dynamics in phthalocyanines studied using degenerate four wave mixing with incoherent light
Excited state dynamics in phthalocyanines studied using degenerate four wave mixing with incoherent light
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DOI：
10.1142/s1088424602000270
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发表时间：
2002-03
影响因子：
1.5
通讯作者：
Venugopal Rao Soma;D. N. Rao
中科院分区：
文献类型：
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作者：
Venugopal Rao Soma;D. N. Rao
介绍了用简并四波非相干光混频(DFWM-IL)测量Pc、CuPc、FePc和ZnPc的激发态动力学的实验结果。对于所有的样品，观察到了三个不同的时间尺度，在作为标准后向几何中探测光束延迟的函数记录的相位共轭信号中。最快的分量(~lt；170ps)与Sn态的相弛豫有关，最慢的分量(∼3-5ps和35-55ps)与S1态的振动和布居弛豫时间有关。本文的结果与用较短的脉冲和类似分子的不同技术获得的结果进行了比较。鉴于这些分子具有很强的光限幅特性，还讨论了这种短寿命的后果。
We present our experimental results on the measurements of excited state dynamics in phthalocyanines (Pc, CuPc, FePc, and ZnPc) using degenerate four wave mixing with incoherent light (DFWM-IL). Three different timescales were observed, for all samples, in the phase conjugate signal recorded as a function of delay in probe beam in the standard backward geometry. The fastest component (< 170 fs) is associated to the phase relaxation in the Sn states and the slowest components (∼3-5 ps and 35-55 ps) to the vibration and population relaxation times from the S1 state. The present results are compared with those obtained with shorter pulses and various techniques for similar molecules. The consequences of such short lifetimes are also discussed in view of the strong optical limiting properties of these molecules.