The interface-sensitive spectroscopic method, sum frequency generation (SFG), has been used to investigate the interfacial water structure on a fused quartz surface modiDed by an octadecyltrichlorosilane (OTS) self-assembled monolayer in phosphate bu†ered solutions at various pHs. The experimental results demonstrate that the water molecules at the quartz/OTS surface Ñip while the water molecules at the OTS surface maintain their orientation when the solution pH is changed from neutral to acidic. The results show that most of the silanol groups still exist on the fused quartz surface even after a silane coup領(lǐng) reaction of OTS under the reported experimental conditions. 表面和頻光譜分析系統(tǒng)(SFG) Ekspla CARS 相干反斯托克斯拉曼顯微光譜儀 PL2230系列高能量全固態(tài)鎖模皮秒Nd:YAG激光器