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

比较了含羧基罗丹明染料和不同取代基AR87、AR9、RhB、Rh6G对二氧化钛吸附性能的差异。结果表明，Rh6G和RhB的吸附量比AR87和AR91的吸附量少一个数量级。我们尝试测量敏化染料分子溶液样品中的拉曼光谱，但此时，我们还没有成功地鉴定出羧基。此外，我们利用锁模Yb-KYW激光器520nm的二次谐波，利用飞秒泵浦探测光谱观察了RhB分子的弛豫过程。发现RhB的激发态有两种弛豫成分，它们具有几皮秒的弛豫和更长的衰变时间。

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.