Dynamic Monitoring of Molecular Structure at Solid/Liquid Interfaces

太阳频率产生（SFG）系统的构造，用于动态结构变化。（a）一条使用355 nm激发光束的泵线被添加到基于ps-based SFG系统中，因此，时间相关的结构更改可以通过~ 2 Ops时间分辨率来跟踪。（b）宽带SFG系统是一个基于100英尺激光器的可见泵红外探测器系统的构造。SFG系统在固体/液体接口上的应用。（a）将TiO_2表面转换为羟基表面和吸收酒精的监测. TiO_2是最受研究的光催化剂和将羟基表面转换为羟基表面通过紫外线照明是一个界面过程。这里， SFG曾用于监测从羟基到羟基表面的转化过程和酒精的吸收。（b）Carrier dynamics in semiconductor nanoclusters Semiconductor nanoclusters attract much attention due to their unique optical properties。光刺激载体（电子和洞）动态在CdS纳米晶体管中分散在玻璃和CdS纳米晶体管中的反向微晶体管被可见泵-IR吸收探测器技术跟踪。（c）Determination of water structure at electrode/electrolyte interface。Although structure of water at electrode surface attracts much interests from both基础和应用程序view points， it is not well understood due to the limitation of techniques。在这里，我们已经成功地测量了黄金薄膜电的水结构，其作用是使用SFG的电潜力。

・Construction of Sun frequency generation (SFG) system for dynamic structure change.(a)A pump line using 355nm excitation beam was added to a ps-based SFG system so that time dependent structure change can be followed with 〜2Ops time resolution.(b)A broad band SFG system was constructed based on a visible pump IR probe system using 100 fs laser.・Applications of the SFG systems to solid/liquid interface.(a)Monitoring of TiO_2 surface for the conversion to hydrophilic surface and adsorption of alcohol.TiO_2 is the most studied photocatalyst and conversion of hydrophobic surface to hydrophilic surface by UV illumination is an interesting process. Here, SFG was used to monitor the conversion process from hydrophobic to hydrophilic surface and the adsorption of alcohol.(b)Carrier dynamics in semiconductor nanoclustersSemiconductor nanoclusters attract much attention due to their unique optical properties. Photoexcited carrier (electron and holes) dynamics in CdSSe nanoclusters dispersed in glass and CdS nanoclusters in reversed micelles were followed by visible pump-IR absorption probe technique.(c)Determination of water structure at electrode/electrolyte interface.Although structure of water at electrode surface attracts much interests from both fundamental and application view points, it is not well understood due to the limitation of techniques. Here, we were successful to measure the water structure at gold film electrode as a function of electrode potential using SFG.