Electrochemical Second Harmonic Generation
EC-SHG is an application of SHG to electrochemical interfaces. As has been described, SHG is a photon-in-photon-out process and can be applied to any kind of interfaces: liquid/solid, liquid/liquid, and solid/solid. The phenomenon is known as the conversion of two photons with the fundamental frequency, ω, in one photon with the second harmonic (SH) frequency, 2ω. Since the SH signal generated from both the several atomic or molecular layers at usual centrosymmetric electrode/electrolyte interfaces, the SH signal is inherently sensitive to interfacial parameters, such as charge density, adsorbate coverage, atomic orientation, and electronic structure around Fermi level. At electrochemical interfaces, electrolyte solution covering the electrode surfaces limits the application of electron spectroscopy, such as UPS and EELS.
KeywordsSurface symmetry Electronic structure Surface coverage In situ measurement Ultrafast dynamics
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