Study of electron transfer at the dye-semiconductor interface using coherent Raman spectroscopy

我们比较了具有羧基和不同取代基的罗丹明染料AR 87、AR 9、RhB、Rh 6 G在二氧化钛上的吸附差异。实验发现，Rh 6 G和RhB的吸附量比AR 87和AR 91的吸附量小一个数量级。我们尝试测量增感染料分子溶液样品中的拉曼光谱，但目前尚未成功鉴定羧基。我们利用锁模Yb KYW激光器输出的520 nm二次谐波飞秒泵浦-探测光谱，观察了RhB分子的弛豫过程。发现RhB的激发态具有两个弛豫分量，具有几皮秒和长得多的衰减时间。

We compared the difference in adsorption to titanium dioxide among rhodamine dyes with a carboxyl group and different substituents, AR87, AR9, RhB, Rh6G. It was found that the amount of adsorption of Rh6G and RhB is less one order of magnitude than that of the AR87 and AR91.We tried to measure the Raman spectrum in the sample of sensitizing dye molecule solution, but at this time, we have not been successful in identification of the carboxyl group.In addition, we observed relaxation processes in RhB molecules by femtosecond pump-probe spectroscopy using the second harmonic of 520nm from a mode-locked Yb-KYW laser. The excited state of RhB was found to have two components of relaxation with few picoseconds and much longer decay times.