Acquisition of a Sum-Frequency Generation Instrument for the Study of the Spectroscopy, Structure, and Chemistry of Interfaces

利用学术研究基础设施计划提供的资金，该小组计划建造一套最先进的激光系统，用于研究利用二次谐波产生(SHG)和红外可见和频(SFG)技术的界面。60皮秒激光输出将在1.2至18微米范围内可调，脉冲能量在5至100微焦耳/脉冲之间。该设施将设在普渡化学激光设施，将组成一个跨学科的界面材料和化学过程研究中心。该装置将用于研究液-液、固-液和气-固界面，研究课题包括：1)化学敏感表面和单层反应性的SFG研究；润滑固体界面分子在可变剪切力作用下的取向和振动光谱；环境颗粒的表面光谱；镍簇电催化剂芳硫醇自组装单分子膜的倍频研究；电化学界面吸附物种的SFG光谱；光活化、催化有机金属薄膜的时间分辨SFG研究；金属表面光聚合的非线性光学和微观研究；多巴胺受体配体的界面取向和生物有效性；溶剂分馏和不混溶液体界面的结构。能够产生二次谐波和和频的脉冲激光装置将用于液-液、液-固和气-固界面的广泛研究。研究的范围从固体电极接触的电解液和水对粘土表面的腐蚀作用到多巴胺受体配体的生物有效性，再到在存在第三种可混溶成分的情况下不相容液体的研究。

With the funds provided by the Academic Research Infrastructure Program this group plants to construct a state-of-the-art laser system for the purpose of studying interfaces making use of both second harmonic generation (SHG) and infrared-visible sum frequency generation (SFG) techniques. The 60 picosecond laser output will be tunable in the range 1.2 to 18 micrometers with pulse energies between 5 and 100 plus microJoules/pulse. The facility, which will be housed at the Purdue Chemistry Laser Facility, will constitute a cross-disciplinary Center for the Study of Interfacial Materials and Chemical Processes. The Facility will be used for the study of liquid-liquid, solid-liquid, and gas-solid interfaces with research topics including: 1) SFG studies of chemically sensitive surfaces and monolayer reactivity; orientation and vibrational spectra of molecules at lubricated solid interfaces under variable shear forces; surface spectroscopy of environmental particles; SHG studies of the nickel cluster electrocatalyst aryl thiol self assembled monolayers; SFG spectroscopy of adsorbed species at electrochemical interfaces; time resolved SFG studies of photoactivated, catalytic organometallic thin films; nonlinear optical and microscopic studies of photopolymerization on metal surfaces; interfacial orientation and biological effectiveness of dopamine receptor ligands; solvent fractionation and structure of immiscible liquid interfaces. A pulsed laser facility capable of second harmonic generation and sum frequency generation will be employed in broad ranging studies of liquid-liquid, liquid-solid, and gas-solid interfaces. The research ranges from the study of electrolytes in contact with solid electrodes and the corrosive effects of water on clay surfaces to the biological effectiveness of dopamine receptor ligands to the study of immiscible liquids in the presence of a third miscible component.