Ultrafast Vibrational Dynamics of Water at a Solid Charged Interface

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Ultrafast Vibrational Dynamics of Water at a Solid Charged Interface Eric Borguet, Temple University, Philadelphia PA, 19122 Ultrafast Time resolved Sum Frequency Generation (tr-SFG) probes the vibrational relaxation of water at the charged and neutral silica surface. Interfacial water vibrational dynamics is significantly different compared to the bulk and it appears to depend on the surface charge. For pure H2O, the vibrational lifetime at the charged surface is similar to the bulk value (~250 fs) whereas at the neutral surface the lifetime is significantly longer (~570 fs). By decoupling the O-H stretching of H2O via isotopic dilution, the effect of hydrogen bond strength on the ultrafast vibrational relaxation of water reveals faster vibrational relaxation of interfacial water with stronger hydrogen bond network.