期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 10, 页码 2328-2334出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b00727
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资金
- U.S. National Science Foundation (NSF) under its graduate research fellowship program (GRFP) award
- Northwestern University Presidential Fellowship
- Shanghai Municipal Science and Technology Commission [16DZ2270100]
- Fudan University
- NSF [CHE-1464916]
- NSF under the Center for Sustainable Nanotechnology [CHE-1503408]
- Alexander von Humboldt Foundation
We report ionic strength-dependent phase shifts in second harmonic generation (SHG) signals from charged interfaces that verify a recent model in which dispersion between the fundamental and second harmonic beams modulates observed signal intensities. We show how phase information can be used to unambiguously separate the chi((2)) and interfacial potential-dependent chi((3)) terms that contribute to the total signal and provide a path to test primitive ion models and mean field theories for the electrical double layer with experiments to which theory must conform. Finally, we demonstrate the new method on supported lipid bilayers and comment on the ability of our new instrument to identify hyper-Rayleigh scattering contributions to common homodyne SHG measurements in reflection geometries.
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