We present SHG amplitude and phase measurements carried out at the fused silica:water interface that yield point estimates for the second-order nonlinear susceptibility and the interfacial potential that are in good agreement with those reported by independent methods under similar conditions of varying pH and an ionic strength of 0.5 M NaCl, as well as varying ionic strength at constant pH. The implications for imaging and real-time tracking of interfacial structure and electrostatics are discussed.

2<sup>nd</sup>-order nonlinear susceptibilities and interfacial potentials from charged interfaces via heterodyne-detected second harmonic generation

ACS Fall 2021

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2nd-order nonlinear susceptibilities and interfacial potentials from charged interfaces via heterodyne-detected second harmonic generation

2^nd-order nonlinear susceptibilities and interfacial potentials from charged interfaces via heterodyne-detected second harmonic generation