Development of Surface Sum-Frequency Generation Spectroscopy

采用Qantel YG501C-10锁模ND: YAG激光器和自制参数振荡器放大器，研制了表面振动和频率产生（SFG）光谱测量仪器。超高真空室也已建成用于SFG测量吸附物或表面键在明确的单晶表面。在常压条件下对石墨烯酸镉的Langmuir-Blodgett （LB）薄膜和超高真空条件下吸附在MgO（100）表面的甲酸离子进行了SFG谱分析。实验结果表明，所研制的装置能够检测0.2层的吸附物。

Instrumentation for the measurement of surface vibrational sum-frequency generation (SFG) spectroscopy has been made by way of a mode-locked ND : YAG laser (Qantel YG501C-10) and a homemade parametric oscillator amplifier. Ultra high-vacuum chamber has also been constructed to use for the SFG measurement of the adsorbates or surface bonds on well-defined single crystal surfaces.The SFG spectroscopy has been made on the Langmuir-Blodgett (LB) films of cadmium arachidate in atmospheric condition and on the formate ion sorbed on MgO (100) surface under ultrahigh vacuum. It was confirmed that the developed device is capable of detecting adsorbates at 0.2 monolayers.