This article provides a glimpse into recent research that has used second-harmonic generation and vibrational sum-frequency generation can be used to study surfaces and interfacial processes. This article describes the current state of research and where it may be headed in the future, including applications in hard surfaces and nanoparticles, biological systems and soft interfaces, and interfacial water spectroscopy. J. Phys. Chem. C 126, 14375–14379 (2022)
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